What is the invalid Dataset Name?

[MaoniinoaM]

I try to attach a dataset to a RCB:
std::string dataset_ref = "simpleIOGenericIO/LLN0$" + "CS_sub" + std::to_string(sub_id);
// std::string dataset_ref = "@CSdatasetsub" + std::to_string(sub_id);

IedConnection_createDataSet(iec61850_client_.ctx, &error, const_cast<char*>(dataset_ref.c_str()), dataset_entry);
if (error == IED_ERROR_OK) {
  rcb = IedConnection_getRCBValues(iec61850_client_.ctx, &error, avail_rcb_ref.c_str(), NULL);
  if (rcb == NULL) {
    error = IED_ERROR_OBJECT_DOES_NOT_EXIST;
  }
}

if (error == IED_ERROR_OK) {
  ClientReportControlBlock_setDataSetReference(rcb, dataset_ref.c_str());

  IedConnection_setRCBValues(
      iec61850_client_.ctx, &error, rcb,RCB_ELEMENT_DATSET,true);
}

but the setRCBValues always return error = 32 which means invalid dataset reference.
please help give some hints why the error happens.

[MaoniinoaM]

I try to create dataset dynamically:
IedConnection_createDataSet(iec61850_client_.ctx, &error, const_cast<char*>(dataset_ref.c_str()), dataset_entry);
and the error show OK.
but when I try to read the dataset with:
if (error == IED_ERROR_OK) {
ClientDataSet clientDataSet =
IedConnection_readDataSetValues(iec61850_client_.ctx, &error, const_cast<char*>(dataset_ref.c_str()), NULL);
if (error == IED_ERROR_OK) {
ClientDataSet_destroy(clientDataSet);
} else {
printf("Failed to read data set (error code: %d)\n", error);
}
}
the error shows 22, no the created dataset. So should I make any configurations in server side?
the server I use is the examples/server_example_config_file