The following is the ORA-23356 error message, you can learn the cause and solution of the Oracle database error.
ORA-23356 masterdef recognizes a master which does not recognize the masterdef
Cause: Possibly DROP_MASTER_REPGROUP was run at a master site but REMOVE_MASTER_DATABASES was not run at master definition site for that master.
Solution: Run REMOVE_MASTER_DATABASES from master definition site to remove the appropriate master (see associated error messages).
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