diff --git a/src/main/java/commands/AddDeadline.java b/src/main/java/commands/AddDeadline.java
index 861577ebc6..d6473f7351 100644
--- a/src/main/java/commands/AddDeadline.java
+++ b/src/main/java/commands/AddDeadline.java
@@ -6,6 +6,7 @@
 
 import exceptions.EmptyDescriptionException;
 import exceptions.InvalidDateFormatException;
+import exceptions.TooManyParametersException;
 import tasks.Deadline;
 import windebot.History;
 import windebot.Reminder;
@@ -30,12 +31,12 @@ public class AddDeadline extends Command {
      */
 
     public boolean execute(String input, Reminder reminder, Ui ui, History history)
-            throws EmptyDescriptionException, InvalidDateFormatException {
+            throws EmptyDescriptionException, InvalidDateFormatException, TooManyParametersException {
         String[] command = input.split(" ", 2);
         String[] order = command[1].split(" /by ");
         String taskDescription = order[0].trim();
         try {
-            if (!(taskDescription.equals("")) && (order.length == 3)) {
+            if (!(taskDescription.equals("")) && (order.length == 2)) {
                 DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm");
                 LocalDateTime deadline = LocalDateTime.parse(order[1], formatter);
                 Deadline deadlineTask = new Deadline(taskDescription, deadline);
@@ -44,13 +45,19 @@ public boolean execute(String input, Reminder reminder, Ui ui, History history)
                 ui.print("    " + deadlineTask.toString());
                 ui.print("Now you have " + reminder.size() + " tasks in the list.");
                 history.save(reminder.getSchedule());
+            } else if (order.length > 2) {
+                throw new TooManyParametersException();
             } else {
-                throw new EmptyDescriptionException("ADD THE CORRECT PARAMETERS!");
+                throw new EmptyDescriptionException();
             }
-            return true;
         } catch (DateTimeParseException e) {
-            throw new InvalidDateFormatException("FOLLOW THE CORRECT DATE FORMAT: DD/MM/YYYY HH:MM");
+            ui.invalidDateFormatMessage();
+        } catch (EmptyDescriptionException e) {
+            ui.emptyDescriptionMessage();
+        } catch (TooManyParametersException e) {
+            ui.tooManyParametersMessage();
         }
+        return true;
     }
 
     /**
diff --git a/src/main/java/commands/AddEvent.java b/src/main/java/commands/AddEvent.java
index 8d48004edc..a22157278a 100644
--- a/src/main/java/commands/AddEvent.java
+++ b/src/main/java/commands/AddEvent.java
@@ -6,6 +6,7 @@
 
 import exceptions.EmptyDescriptionException;
 import exceptions.InvalidDateFormatException;
+import exceptions.TooManyParametersException;
 import tasks.Event;
 import windebot.History;
 import windebot.Reminder;
@@ -27,11 +28,11 @@ public class AddEvent extends Command {
      * @param ui The Ui object used to interact with the user.
      * @param history The History object used to save the data
      * @return true if the command was executed successfully.
-     * @throws EmptyDescriptionException If the input is incomplete or incorrectly formatted.
+     * @throws InvalidDateFormatException If the input date is incorrectly formatted.
      */
 
     public boolean execute(String input, Reminder reminder, Ui ui, History history)
-            throws EmptyDescriptionException, InvalidDateFormatException {
+            throws EmptyDescriptionException, InvalidDateFormatException, TooManyParametersException {
         String[] command = input.split(" ", 2);
         String[] order = command[1].split(" /from | /to ");
         String taskDescription = order[0].trim();
@@ -46,13 +47,19 @@ public boolean execute(String input, Reminder reminder, Ui ui, History history)
                 ui.print("    " + eventTask.toString());
                 ui.print("Now you have " + reminder.size() + " tasks in the list.");
                 history.save(reminder.getSchedule());
+            } else if (order.length > 3) {
+                throw new TooManyParametersException();
             } else {
-                throw new EmptyDescriptionException("ADD THE CORRECT PARAMETERS!");
+                throw new EmptyDescriptionException();
             }
-            return true;
         } catch (DateTimeParseException e) {
-            throw new InvalidDateFormatException("FOLLOW THE CORRECT DATE FORMAT: DD/MM/YYYY HH:MM");
+            ui.invalidDateFormatMessage();
+        } catch (EmptyDescriptionException e) {
+            ui.emptyDescriptionMessage();
+        } catch (TooManyParametersException e) {
+            ui.tooManyParametersMessage();
         }
+        return true;
     }
 
     /**
diff --git a/src/main/java/commands/AddMark.java b/src/main/java/commands/AddMark.java
index 441fdcddc4..79ece7633d 100644
--- a/src/main/java/commands/AddMark.java
+++ b/src/main/java/commands/AddMark.java
@@ -3,7 +3,6 @@
 import exceptions.EmptyDescriptionException;
 import exceptions.IndexOutBoundsException;
 import exceptions.NotIntegerException;
-import exceptions.TooManyParametersException;
 import windebot.History;
 import windebot.Reminder;
 import windebot.Ui;
@@ -25,34 +24,38 @@ public class AddMark extends Command {
      * @param history The History object used to save the data
      * @return true if the command was executed successfully.
      * @throws EmptyDescriptionException If no index is provided in the input.
-     * @throws TooManyParametersException If too many parameters are provided in the input.
      * @throws NotIntegerException If no integer is provided in the input.
      * @throws IndexOutBoundsException If integer provided is out of bounds.
      */
 
     public boolean execute(String input, Reminder reminder, Ui ui, History history)
-            throws EmptyDescriptionException, TooManyParametersException,
-            NotIntegerException, IndexOutBoundsException {
-        String[] command = input.split(" ");
-        assert(command.length == 2);
+            throws NotIntegerException, IndexOutBoundsException, EmptyDescriptionException {
         try {
-            int index = Integer.parseInt(command[1].trim());
-            if (command.length == 2) {
-                ui.print("Nice! I've marked this task as done:");
+            String[] command = input.split(" ", 2);
+            if (command.length < 2) {
+                throw new EmptyDescriptionException();
+            }
+            String search = command[1].trim();
+            if (!(search.equals(""))) {
+                int index = Integer.parseInt(command[1].trim());
+                if (index > reminder.size() + 1) {
+                    throw new IndexOutOfBoundsException();
+                }
                 reminder.mark(index - 1);
+                ui.print("Nice! I've marked this task as done:");
                 ui.print("    " + reminder.getTask(Integer.parseInt(command[1]) - 1).toString());
                 history.save(reminder.getSchedule());
-            } else if (command.length < 2) {
-                throw new EmptyDescriptionException("I NEED TO KNOW WHAT I'M MARKING!");
             } else {
-                throw new TooManyParametersException("ONE AT A TIME!");
+                throw new EmptyDescriptionException();
             }
-            return true;
         } catch (NumberFormatException e) {
-            throw new NotIntegerException("THAT IS NOT AN INTEGER!");
-        } catch (StringIndexOutOfBoundsException e) {
-            throw new IndexOutBoundsException("THIS IS NOT A VALID TASK NUMBER!");
+            ui.notIntegerMessage();
+        } catch (IndexOutOfBoundsException e) {
+            ui.indexOutBoundsMessage();
+        } catch (EmptyDescriptionException e) {
+            ui.emptyDescriptionMessage();
         }
+        return true;
     }
 
     /**
diff --git a/src/main/java/commands/AddTodo.java b/src/main/java/commands/AddTodo.java
index c013052b3d..d8024043d5 100644
--- a/src/main/java/commands/AddTodo.java
+++ b/src/main/java/commands/AddTodo.java
@@ -27,17 +27,24 @@ public class AddTodo extends Command {
 
     public boolean execute(String input, Reminder reminder, Ui ui, History history)
             throws EmptyDescriptionException {
-        String[] command = input.split(" ", 2);
-        String taskDescription = command[1].trim();
-        if (!(taskDescription.equals(""))) {
-            Todos todoTask = new Todos(taskDescription);
-            reminder.addTodo(todoTask);
-            ui.print("Got it. I've added this task:");
-            ui.print("    " + todoTask.toString());
-            ui.print("Now you have " + reminder.size() + " tasks in the list.");
-            history.save(reminder.getSchedule());
-        } else {
-            throw new EmptyDescriptionException("I NEED TO KNOW WHAT I'M TODO-ING!");
+        try {
+            String[] command = input.split(" ", 2);
+            if (command.length < 2) {
+                throw new EmptyDescriptionException();
+            }
+            String taskDescription = command[1].trim();
+            if (!(taskDescription.equals(""))) {
+                Todos todoTask = new Todos(taskDescription);
+                reminder.addTodo(todoTask);
+                ui.print("Got it. I've added this task:");
+                ui.print("    " + todoTask.toString());
+                ui.print("Now you have " + reminder.size() + " tasks in the list.");
+                history.save(reminder.getSchedule());
+            } else {
+                throw new EmptyDescriptionException();
+            }
+        } catch (EmptyDescriptionException e) {
+            ui.emptyDescriptionMessage();
         }
         return true;
     }
diff --git a/src/main/java/commands/AddUnmark.java b/src/main/java/commands/AddUnmark.java
index 9d6ff39852..02ba41f3d1 100644
--- a/src/main/java/commands/AddUnmark.java
+++ b/src/main/java/commands/AddUnmark.java
@@ -3,7 +3,6 @@
 import exceptions.EmptyDescriptionException;
 import exceptions.IndexOutBoundsException;
 import exceptions.NotIntegerException;
-import exceptions.TooManyParametersException;
 import windebot.History;
 import windebot.Reminder;
 import windebot.Ui;
@@ -25,34 +24,38 @@ public class AddUnmark extends Command {
      * @param history The History object used to save the data
      * @return true if the command was executed successfully.
      * @throws EmptyDescriptionException If no index is provided in the input.
-     * @throws TooManyParametersException If too many parameters are provided in the input.
      * @throws NotIntegerException If no integer is provided in the input.
      * @throws IndexOutBoundsException If integer provided is out of bounds.
      */
 
     public boolean execute(String input, Reminder reminder, Ui ui, History history)
-            throws EmptyDescriptionException, TooManyParametersException,
-            NotIntegerException, IndexOutBoundsException {
-        String[] command = input.split(" ");
-        assert(command.length == 2);
+            throws NotIntegerException, IndexOutBoundsException, EmptyDescriptionException {
         try {
-            int index = Integer.parseInt(command[1].trim());
-            if (command.length == 2) {
-                ui.print("Ok! I've marked this task as not done:");
+            String[] command = input.split(" ", 2);
+            if (command.length < 2) {
+                throw new EmptyDescriptionException();
+            }
+            String search = command[1].trim();
+            if (!(search.equals(""))) {
+                int index = Integer.parseInt(command[1].trim());
+                if (index > reminder.size() + 1) {
+                    throw new IndexOutOfBoundsException();
+                }
                 reminder.unmark(index - 1);
+                ui.print("Ok! I've marked this task as not done:");
                 ui.print("    " + reminder.getTask(Integer.parseInt(command[1]) - 1).toString());
                 history.save(reminder.getSchedule());
-            } else if (command.length < 2) {
-                throw new EmptyDescriptionException("I NEED TO KNOW WHAT I'M MARKING!");
             } else {
-                throw new TooManyParametersException("ONE AT A TIME!");
+                throw new EmptyDescriptionException();
             }
-            return true;
         } catch (NumberFormatException e) {
-            throw new NotIntegerException("THAT IS NOT AN INTEGER!");
-        } catch (StringIndexOutOfBoundsException e) {
-            throw new IndexOutBoundsException("THIS IS NOT A VALID TASK NUMBER!");
+            ui.notIntegerMessage();
+        } catch (IndexOutOfBoundsException e) {
+            ui.indexOutBoundsMessage();
+        } catch (EmptyDescriptionException e) {
+            ui.emptyDescriptionMessage();
         }
+        return true;
     }
 
     /**
diff --git a/src/main/java/commands/ChangeCommand.java b/src/main/java/commands/ChangeCommand.java
index 7040bd2a3a..79f46be601 100644
--- a/src/main/java/commands/ChangeCommand.java
+++ b/src/main/java/commands/ChangeCommand.java
@@ -31,57 +31,63 @@ public class ChangeCommand extends Command {
 
     public boolean execute(String input, Reminder reminder, Ui ui, History history)
             throws EmptyDescriptionException {
-        String[] command = input.split(" ", 2);
-        assert(command.length == 2);
-        int toChange = reminder.getSelected();
-        Task task = reminder.getSchedule().get(toChange);
-        if (command[0].equalsIgnoreCase("change")) {
-            toChange = Integer.parseInt(command[1]) - 1;
-            reminder.changeSelected(toChange);
-            task = reminder.getSchedule().get(toChange);
-            ui.print("Got it. You want to edit this task:");
-            ui.print("    " + task.toString());
-            ui.print("To change the task description, input: action (task description)");
-            if (task.getClass() == Deadline.class) {
-                ui.print("To change the deadline, input: cutoff (new deadline)");
-            } else if (task.getClass() == Event.class) {
-                ui.print("To change the start date, input: start (new start)");
-                ui.print("To change the end date, input: end (new end)");
+        try {
+            String[] command = input.split(" ", 2);
+            if (command.length < 2) {
+                throw new EmptyDescriptionException();
             }
-        } else if (command[0].equalsIgnoreCase("action")) {
-            task.changeAction(command[1]);
-            ui.print("Got it. The task has been changed to:");
-            ui.print("    " + task.toString());
-            ui.print("Now you have " + reminder.size() + " tasks in the list.");
-        } else if (command[0].equalsIgnoreCase("cutoff")
-                && task.getClass() == Deadline.class) {
-            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm");
-            LocalDateTime deadline = LocalDateTime.parse(command[1], formatter);
-            task.changeDate(deadline);
-            ui.print("Got it. The task has been changed to:");
-            ui.print("    " + task.toString());
-            ui.print("Now you have " + reminder.size() + " tasks in the list.");
-            history.save(reminder.getSchedule());
-        } else if (command[0].equalsIgnoreCase("start")
-                && task.getClass() == Event.class) {
-            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm");
-            LocalDateTime start = LocalDateTime.parse(command[1], formatter);
-            task.changeStartDate(start);
-            ui.print("Got it. The task has been changed to:");
-            ui.print("    " + task.toString());
-            ui.print("Now you have " + reminder.size() + " tasks in the list.");
-            history.save(reminder.getSchedule());
-        } else if (command[0].equalsIgnoreCase("end")
-                && task.getClass() == Event.class) {
-            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm");
-            LocalDateTime end = LocalDateTime.parse(command[1], formatter);
-            task.changeEndDate(end);
-            ui.print("Got it. The task has been changed to:");
-            ui.print("    " + task.toString());
-            ui.print("Now you have " + reminder.size() + " tasks in the list.");
-            history.save(reminder.getSchedule());
-        } else {
-            throw new EmptyDescriptionException("PUT IN PARAMETERS");
+            int toChange = reminder.getSelected();
+            Task task = reminder.getSchedule().get(toChange);
+            if (command[0].equalsIgnoreCase("change")) {
+                toChange = Integer.parseInt(command[1]) - 1;
+                reminder.changeSelected(toChange);
+                task = reminder.getSchedule().get(toChange);
+                ui.print("Got it. You want to edit this task:");
+                ui.print("    " + task.toString());
+                ui.print("To change the task description, input: action (task description)");
+                if (task.getClass() == Deadline.class) {
+                    ui.print("To change the deadline, input: cutoff (new deadline)");
+                } else if (task.getClass() == Event.class) {
+                    ui.print("To change the start date, input: start (new start)");
+                    ui.print("To change the end date, input: end (new end)");
+                }
+            } else if (command[0].equalsIgnoreCase("action")) {
+                task.changeAction(command[1]);
+                ui.print("Got it. The task has been changed to:");
+                ui.print("    " + task.toString());
+                ui.print("Now you have " + reminder.size() + " tasks in the list.");
+            } else if (command[0].equalsIgnoreCase("cutoff")
+                    && task.getClass() == Deadline.class) {
+                DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm");
+                LocalDateTime deadline = LocalDateTime.parse(command[1], formatter);
+                task.changeDate(deadline);
+                ui.print("Got it. The task has been changed to:");
+                ui.print("    " + task.toString());
+                ui.print("Now you have " + reminder.size() + " tasks in the list.");
+                history.save(reminder.getSchedule());
+            } else if (command[0].equalsIgnoreCase("start")
+                    && task.getClass() == Event.class) {
+                DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm");
+                LocalDateTime start = LocalDateTime.parse(command[1], formatter);
+                task.changeStartDate(start);
+                ui.print("Got it. The task has been changed to:");
+                ui.print("    " + task.toString());
+                ui.print("Now you have " + reminder.size() + " tasks in the list.");
+                history.save(reminder.getSchedule());
+            } else if (command[0].equalsIgnoreCase("end")
+                    && task.getClass() == Event.class) {
+                DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm");
+                LocalDateTime end = LocalDateTime.parse(command[1], formatter);
+                task.changeEndDate(end);
+                ui.print("Got it. The task has been changed to:");
+                ui.print("    " + task.toString());
+                ui.print("Now you have " + reminder.size() + " tasks in the list.");
+                history.save(reminder.getSchedule());
+            } else {
+                throw new EmptyDescriptionException();
+            }
+        } catch (EmptyDescriptionException e) {
+            ui.emptyDescriptionMessage();
         }
         return true;
     }
diff --git a/src/main/java/commands/DateCommand.java b/src/main/java/commands/DateCommand.java
index 9e7ad242a6..56322d0fab 100644
--- a/src/main/java/commands/DateCommand.java
+++ b/src/main/java/commands/DateCommand.java
@@ -2,10 +2,10 @@
 
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeParseException;
 import java.util.ArrayList;
 
 import exceptions.EmptyDescriptionException;
-import exceptions.TooManyParametersException;
 import tasks.Task;
 import windebot.History;
 import windebot.Reminder;
@@ -27,28 +27,35 @@ public class DateCommand extends Command {
      * @param history The History object used to save the data
      * @return true if the command was executed successfully.
      * @throws EmptyDescriptionException If no date is provided in the input.
-     * @throws TooManyParametersException If too many parameters are provided in the input.
+     * @throws DateTimeParseException If date is not correct.
      */
     public boolean execute(String input, Reminder reminder, Ui ui, History history)
-            throws EmptyDescriptionException, TooManyParametersException {
-        String[] command = input.split(" ");
-        assert(command.length == 2);
-        if (command.length == 2) {
-            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
-            LocalDate date = LocalDate.parse(command[1], formatter);
-            ui.print("These are the tasks you have for " + date.toString());
-            ArrayList<Task> tasksOnDate = reminder.getTasksOnDate(date);
-            if (tasksOnDate != null) {
-                for (Task task : tasksOnDate) {
-                    ui.print(task.toString());
+            throws EmptyDescriptionException {
+        try {
+            String[] command = input.split(" ", 2);
+            if (command.length < 2) {
+                throw new EmptyDescriptionException();
+            }
+            String search = command[1].trim();
+            if (!(search.equals(""))) {
+                DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
+                LocalDate date = LocalDate.parse(command[1], formatter);
+                ui.print("These are the tasks you have for " + date.toString());
+                ArrayList<Task> tasksOnDate = reminder.getTasksOnDate(date);
+                if (tasksOnDate != null) {
+                    for (Task task : tasksOnDate) {
+                        ui.print(task.toString());
+                    }
+                } else {
+                    ui.print("Hurray! No tasks on: " + date.toString());
                 }
             } else {
-                ui.print("Hurray! No tasks on: " + date.toString());
+                throw new EmptyDescriptionException();
             }
-        } else if (command.length < 2) {
-            throw new EmptyDescriptionException("I NEED TO KNOW THE DATE!");
-        } else {
-            throw new TooManyParametersException("ONE AT A TIME!");
+        } catch (DateTimeParseException e) {
+            ui.invalidDateFormatMessage();
+        } catch (EmptyDescriptionException e) {
+            ui.emptyDescriptionMessage();
         }
         return true;
     }
diff --git a/src/main/java/commands/FindCommand.java b/src/main/java/commands/FindCommand.java
index f330a2737b..11a7030b25 100644
--- a/src/main/java/commands/FindCommand.java
+++ b/src/main/java/commands/FindCommand.java
@@ -27,26 +27,31 @@ public class FindCommand extends Command {
      */
 
     public boolean execute(String input, Reminder reminder, Ui ui, History history)
-            throws EmptyDescriptionException, TooManyParametersException {
-        String[] command = input.split(" ", 2);
-        assert(command.length == 2);
-        if (command.length == 2) {
-            ui.print("Here are the matching tasks in your list:");
-            String keyWord = command[1];
-            boolean isTaskFound = true;
-            for (Task task : reminder.getSchedule()) {
-                if (task.getAction().contains(keyWord)) {
-                    ui.print(task.toString());
-                    isTaskFound = false;
-                }
+            throws EmptyDescriptionException {
+        try {
+            String[] command = input.split(" ", 2);
+            if (command.length < 2) {
+                throw new EmptyDescriptionException();
             }
-            if (isTaskFound) {
-                ui.print("No words matches your query stoopid");
+            String search = command[1].trim();
+            if (!(search.equals(""))) {
+                ui.print("Here are the matching tasks in your list:");
+                String keyWord = command[1];
+                boolean isTaskFound = true;
+                for (Task task : reminder.getSchedule()) {
+                    if (task.getAction().contains(keyWord)) {
+                        ui.print(task.toString());
+                        isTaskFound = false;
+                    }
+                }
+                if (isTaskFound) {
+                    ui.print("No words matches your query stoopid");
+                }
+            } else {
+                throw new EmptyDescriptionException();
             }
-        } else if (command.length < 2) {
-            throw new EmptyDescriptionException("I NEED TO KNOW WHAT I'M MARKING!");
-        } else {
-            throw new TooManyParametersException("ONE AT A TIME!");
+        } catch (EmptyDescriptionException e) {
+            ui.emptyDescriptionMessage();
         }
         return true;
     }
diff --git a/src/main/java/commands/RemoveCommand.java b/src/main/java/commands/RemoveCommand.java
index 44e60cf92f..7f7d15b81e 100644
--- a/src/main/java/commands/RemoveCommand.java
+++ b/src/main/java/commands/RemoveCommand.java
@@ -1,6 +1,7 @@
 package commands;
 
 import exceptions.EmptyDescriptionException;
+import exceptions.IndexOutBoundsException;
 import exceptions.TooManyParametersException;
 import tasks.Task;
 import windebot.History;
@@ -28,18 +29,25 @@ public class RemoveCommand extends Command {
      */
     public boolean execute(String input, Reminder reminder, Ui ui, History history)
             throws EmptyDescriptionException, TooManyParametersException {
-        String[] command = input.split(" ");
-        assert(command.length == 2);
-        if (command.length == 2) {
-            Task deleted = reminder.remove(Integer.parseInt(command[1]) - 1);
-            ui.print("Noted. I've removed this task:");
-            ui.print("    " + deleted.toString());
-            ui.print("Now you have " + reminder.size() + " tasks in the list.");
-            history.save(reminder.getSchedule());
-        } else if (command.length < 2) {
-            throw new EmptyDescriptionException("I NEED TO KNOW WHAT I'M DELETING!");
-        } else {
-            throw new TooManyParametersException("ONE AT A TIME!");
+        try {
+            String[] command = input.split(" ", 2);
+            if (command.length < 2) {
+                throw new EmptyDescriptionException();
+            }
+            String search = command[1].trim();
+            if (!(search.equals(""))) {
+                Task deleted = reminder.remove(Integer.parseInt(command[1]) - 1);
+                ui.print("Noted. I've removed this task:");
+                ui.print("    " + deleted.toString());
+                ui.print("Now you have " + reminder.size() + " tasks in the list.");
+                history.save(reminder.getSchedule());
+            } else {
+                throw new EmptyDescriptionException();
+            }
+        } catch (EmptyDescriptionException e) {
+            ui.emptyDescriptionMessage();
+        } catch (IndexOutBoundsException e) {
+            ui.indexOutBoundsMessage();
         }
         return true;
     }
diff --git a/src/main/java/exceptions/EmptyDescriptionException.java b/src/main/java/exceptions/EmptyDescriptionException.java
index 33ad2a2f94..31d6e10fd0 100644
--- a/src/main/java/exceptions/EmptyDescriptionException.java
+++ b/src/main/java/exceptions/EmptyDescriptionException.java
@@ -8,10 +8,8 @@ public class EmptyDescriptionException extends Exception {
 
     /**
      * Constructs a new EmptyDescriptionException with the specified detail message.
-     *
-     * @param message The detail message explaining the reason for the exception.
      */
-    public EmptyDescriptionException(String message) {
-        super(message);
+    public EmptyDescriptionException() {
+        super("Either you've missed some parameters or you typed the command wrongly");
     }
 }
diff --git a/src/main/java/exceptions/IndexOutBoundsException.java b/src/main/java/exceptions/IndexOutBoundsException.java
index ad8bd0e8fc..d2b8553392 100644
--- a/src/main/java/exceptions/IndexOutBoundsException.java
+++ b/src/main/java/exceptions/IndexOutBoundsException.java
@@ -4,14 +4,12 @@
  * The IndexOutBoundsException is thrown when the Index is out of bounds.
  * This exception is typically used in commands that require Integer input.
  */
-public class IndexOutBoundsException extends Exception {
+public class IndexOutBoundsException extends IndexOutOfBoundsException {
 
     /**
      * Constructs a new IndexOutBoundsException with the specified detail message.
-     *
-     * @param message The detail message explaining the reason for the exception.
      */
-    public IndexOutBoundsException(String message) {
-        super(message);
+    public IndexOutBoundsException() {
+        super("Input a valid task number");
     }
 }
diff --git a/src/main/java/exceptions/InvalidDateFormatException.java b/src/main/java/exceptions/InvalidDateFormatException.java
index c34597ae0c..841a1243b7 100644
--- a/src/main/java/exceptions/InvalidDateFormatException.java
+++ b/src/main/java/exceptions/InvalidDateFormatException.java
@@ -8,8 +8,6 @@ public class InvalidDateFormatException extends Exception {
 
     /**
      * Constructs a new InvalidDateFormatException with the specified detail message.
-     *
-     * @param message The detail message explaining the reason for the exception.
      */
     public InvalidDateFormatException(String message) {
         super(message);
diff --git a/src/main/java/exceptions/NotIntegerException.java b/src/main/java/exceptions/NotIntegerException.java
index f8d5aca4bc..c92ac6a0d0 100644
--- a/src/main/java/exceptions/NotIntegerException.java
+++ b/src/main/java/exceptions/NotIntegerException.java
@@ -8,10 +8,8 @@ public class NotIntegerException extends Exception {
 
     /**
      * Constructs a new NotIntegerException with the specified detail message.
-     *
-     * @param message The detail message explaining the reason for the exception.
      */
-    public NotIntegerException(String message) {
-        super(message);
+    public NotIntegerException() {
+        super("Input a valid Integer stoopid");
     }
 }
diff --git a/src/main/java/exceptions/TooManyParametersException.java b/src/main/java/exceptions/TooManyParametersException.java
index 719dae6b10..dc2ed389d3 100644
--- a/src/main/java/exceptions/TooManyParametersException.java
+++ b/src/main/java/exceptions/TooManyParametersException.java
@@ -8,10 +8,8 @@ public class TooManyParametersException extends Exception {
 
     /**
      * Constructs a new TooManyParametersException with the specified detail message.
-     *
-     * @param message The detail message explaining the reason for the exception.
      */
-    public TooManyParametersException(String message) {
-        super(message);
+    public TooManyParametersException() {
+        super("One input at a time!");
     }
 }
diff --git a/src/main/java/exceptions/UnsupportedCommandException.java b/src/main/java/exceptions/UnsupportedCommandException.java
index aaada10e3d..82b8a0aa83 100644
--- a/src/main/java/exceptions/UnsupportedCommandException.java
+++ b/src/main/java/exceptions/UnsupportedCommandException.java
@@ -8,10 +8,8 @@ public class UnsupportedCommandException extends Exception {
 
     /**
      * Constructs a new UnsupportedCommandException with the specified detail message.
-     *
-     * @param message The detail message explaining the reason for the exception.
      */
-    public UnsupportedCommandException(String message) {
-        super(message);
+    public UnsupportedCommandException() {
+        super("GO TO OUR GITHUB PAGE FOR THE LIST OF COMMANDS STOOPID!");
     }
 }
diff --git a/src/main/java/exceptions/UnsupportedFilePathException.java b/src/main/java/exceptions/UnsupportedFilePathException.java
index dc50faeea5..4102650986 100644
--- a/src/main/java/exceptions/UnsupportedFilePathException.java
+++ b/src/main/java/exceptions/UnsupportedFilePathException.java
@@ -8,10 +8,8 @@ public class UnsupportedFilePathException extends Exception {
 
     /**
      * Constructs a new UnsupportedFilePathException with the specified detail message.
-     *
-     * @param message The detail message explaining the reason for the exception.
      */
-    public UnsupportedFilePathException(String message) {
-        super(message);
+    public UnsupportedFilePathException() {
+        super("WRONG SAVE FILE!");
     }
 }
diff --git a/src/main/java/windebot/Parser.java b/src/main/java/windebot/Parser.java
index 5f6bd21330..de66799bff 100644
--- a/src/main/java/windebot/Parser.java
+++ b/src/main/java/windebot/Parser.java
@@ -13,6 +13,7 @@
 import commands.FindCommand;
 import commands.ListCommand;
 import commands.RemoveCommand;
+import exceptions.EmptyDescriptionException;
 import exceptions.UnsupportedCommandException;
 
 /**
@@ -30,7 +31,11 @@ public class Parser {
      * @throws UnsupportedCommandException If the command is not recognized.
      */
 
-    public static Command parse(String input) throws UnsupportedCommandException {
+    public static Command parse(String input)
+            throws UnsupportedCommandException, EmptyDescriptionException {
+        if (input.equals("")) {
+            throw new EmptyDescriptionException();
+        }
         String[] parts = input.split(" ", 2);
         SubCommandType command = getCommandType(parts[0]);
         // String arguments = (parts.length > 1) ? parts[1] : "";
@@ -74,10 +79,10 @@ public static Command parse(String input) throws UnsupportedCommandException {
                 commands = new ErrorCommand();
                 break;
             default:
-                throw new UnsupportedCommandException("TYPE /HELP FOR HELP STOOPIDD");
+                throw new UnsupportedCommandException();
             }
         } catch (UnsupportedCommandException uce) {
-            System.out.println("TYPE /HELP FOR HELP STOOPIDD: " + uce.getMessage());
+            throw new UnsupportedCommandException();
         }
         return commands;
     }
@@ -90,29 +95,29 @@ public static Command parse(String input) throws UnsupportedCommandException {
      */
 
     private static SubCommandType getCommandType(String input) {
-        if (input.startsWith("todo ")) {
+        if (input.startsWith("todo")) {
             return SubCommandType.TODO;
-        } else if (input.startsWith("deadline ")) {
+        } else if (input.startsWith("deadline")) {
             return SubCommandType.DEADLINE;
-        } else if (input.startsWith("event ")) {
+        } else if (input.startsWith("event")) {
             return SubCommandType.EVENT;
         } else if (input.equals("list")) {
             return SubCommandType.LIST;
-        } else if (input.startsWith("delete ")) {
+        } else if (input.startsWith("delete")) {
             return SubCommandType.DELETE;
         } else if (input.equals("bye")) {
             return SubCommandType.BYE;
-        } else if (input.startsWith("mark ")) {
+        } else if (input.startsWith("mark")) {
             return SubCommandType.MARK;
-        } else if (input.startsWith("unmark ")) {
+        } else if (input.startsWith("unmark")) {
             return SubCommandType.UNMARK;
-        } else if (input.startsWith("date ")) {
+        } else if (input.startsWith("date")) {
             return SubCommandType.DATE;
-        } else if (input.startsWith("find ")) {
+        } else if (input.startsWith("find")) {
             return SubCommandType.FIND;
-        } else if (input.startsWith("change ") || input.startsWith("cutoff ")
-                || input.startsWith("start ") || input.startsWith("end ")
-                || input.startsWith("action ")) {
+        } else if (input.startsWith("change") || input.startsWith("cutoff")
+                || input.startsWith("start") || input.startsWith("end")
+                || input.startsWith("action")) {
             return SubCommandType.CHANGE;
         } else {
             return SubCommandType.UNKNOWN;
diff --git a/src/main/java/windebot/Reminder.java b/src/main/java/windebot/Reminder.java
index 887961a7c0..c6a299d191 100644
--- a/src/main/java/windebot/Reminder.java
+++ b/src/main/java/windebot/Reminder.java
@@ -4,6 +4,7 @@
 import java.util.ArrayList;
 import java.util.Hashtable;
 
+import exceptions.IndexOutBoundsException;
 import tasks.Deadline;
 import tasks.Event;
 import tasks.Task;
@@ -15,10 +16,10 @@
  */
 
 public class Reminder {
-    private static ArrayList<Task> schedule;
-    private static Hashtable<LocalDate, ArrayList<Task>> calendar;
+    private ArrayList<Task> schedule;
+    private Hashtable<LocalDate, ArrayList<Task>> calendar;
 
-    private static int selected;
+    private int selected;
 
     /**
      * Constructs a Reminder object with an empty task list and calendar.
@@ -65,7 +66,7 @@ public class Reminder {
      * @param task The Event task to add.
      */
 
-    public static void addEvent(Event task) {
+    public void addEvent(Event task) {
         schedule.add(task);
         calendar.computeIfAbsent(task.getDate(), key -> new ArrayList<>()).add(task);
     }
@@ -76,7 +77,7 @@ public static void addEvent(Event task) {
      * @param task The Deadline task to add.
      */
 
-    public static void addDeadline(Deadline task) {
+    public void addDeadline(Deadline task) {
         schedule.add(task);
         calendar.computeIfAbsent(task.getDate(), key -> new ArrayList<>()).add(task);
     }
@@ -87,7 +88,7 @@ public static void addDeadline(Deadline task) {
      * @param task The Todos task to add.
      */
 
-    public static void addTodo(Todos task) {
+    public void addTodo(Todos task) {
         schedule.add(task);
     }
 
@@ -98,7 +99,10 @@ public static void addTodo(Todos task) {
      * @return The removed task.
      */
 
-    public static Task remove(int i) {
+    public Task remove(int i) throws IndexOutBoundsException {
+        if (i > size()) {
+            throw new IndexOutBoundsException();
+        }
         Task task = schedule.remove(i);
         LocalDate date = task.getDate();
         calendar.computeIfPresent(date, (key, value) -> {
@@ -116,7 +120,7 @@ public static Task remove(int i) {
      * @return The removed task.
      */
 
-    public static Task replace(int i, Task newTask) {
+    public Task replace(int i, Task newTask) {
         Task task = schedule.get(i);
         schedule.set(i, newTask);
         LocalDate date = task.getDate();
@@ -133,7 +137,10 @@ public static Task replace(int i, Task newTask) {
      * @param i The index of the task to mark as completed.
      */
 
-    public static void mark(int i) {
+    public void mark(int i) throws IndexOutBoundsException {
+        if (i > size()) {
+            throw new IndexOutBoundsException();
+        }
         Task task = schedule.remove(i);
         if (task.getClass() != Todos.class) {
             LocalDate date = task.getDate();
@@ -154,7 +161,10 @@ public static void mark(int i) {
      * @param i The index of the task to mark as not completed.
      */
 
-    public static void unmark(int i) {
+    public void unmark(int i) throws IndexOutBoundsException {
+        if (i > size()) {
+            throw new IndexOutBoundsException();
+        }
         Task task = schedule.remove(i);
         if (task.getClass() != Todos.class) {
             LocalDate date = task.getDate();
@@ -176,11 +186,11 @@ public static void unmark(int i) {
      * @return The list of tasks on the specified date.
      */
 
-    public static ArrayList<Task> getTasksOnDate(LocalDate date) {
+    public ArrayList<Task> getTasksOnDate(LocalDate date) {
         return calendar.getOrDefault(date, new ArrayList<>());
     }
 
-    public static ArrayList<Task> getSchedule() {
+    public ArrayList<Task> getSchedule() {
         return schedule;
     }
 
@@ -194,7 +204,7 @@ public int getSelected() {
      * @param i The int of the new selected task to edit
      */
 
-    public static void changeSelected(int i) {
+    public void changeSelected(int i) {
         selected = i;
     }
 
@@ -205,11 +215,11 @@ public static void changeSelected(int i) {
      * @return The task at the specified index.
      */
 
-    public static Task getTask(int i) {
+    public Task getTask(int i) {
         return schedule.get(i);
     }
 
-    public static int size() {
+    public int size() {
         return schedule.size();
     }
 }
diff --git a/src/main/java/windebot/Ui.java b/src/main/java/windebot/Ui.java
index 235fa496ec..cca76d300e 100644
--- a/src/main/java/windebot/Ui.java
+++ b/src/main/java/windebot/Ui.java
@@ -82,4 +82,32 @@ public void print(String addWhat) {
     public String getOutput() {
         return this.output;
     }
+
+    public void invalidDateFormatMessage() {
+        this.print("FOLLOW THE CORRECT DATE FORMAT: DD/MM/YYYY HH:MM");
+    }
+
+    public void emptyDescriptionMessage() {
+        this.print("Either you've missed some parameters or you typed the command wrongly");
+    }
+
+    public void indexOutBoundsMessage() {
+        this.print("Input a valid task number");
+    }
+
+    public void notIntegerMessage() {
+        this.print("Input a valid Integer stoopid");
+    }
+
+    public void tooManyParametersMessage() {
+        this.print("One input at a time!");
+    }
+
+    public void unsupportedCommandMessage() {
+        this.print("GO TO OUR GITHUB PAGE FOR THE LIST OF COMMANDS STOOPID!");
+    }
+
+    public void unsupportedFilePathMessage() {
+        this.print("WRONG SAVE FILE!");
+    }
 }