Oracle Solution for Error ora-16736

ORA-16736: unable to find the destination entry of standby database "string" in V$ARCHIVE_DEST

What triggered the Error:

Either the standby destination was manually changed or deleted outside of Data Guard broker, or no entry was available for the Data Guard broker to use.

What should we do to fix it:

Clean up the destination setting, remove the unused settings, and reset the redo transport service.