error[E0573]: expected type, found variant `Ok`
  --> pow-migration/src/lib.rs:91:13
   |
91 | ) -> Result<Ok(u32), Error> {
   |             ^^^^^^^ not a type
   |
help: try using the variant's enum
   |
91 | ) -> Result<core::result::Result, Error> {
   |             ~~~~~~~~~~~~~~~~~~~~
91 | ) -> Result<nimiq_transaction::ExecutedTransaction, Error> {
   |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
91 | ) -> Result<serde::__private, Error> {
   |             ~~~~~~~~~~~~~~~~
91 | ) -> Result<std::result::Result, Error> {
   |             ~~~~~~~~~~~~~~~~~~~