Oracle : Ошибка ORA-16633

"the only instance of the database cannot be removed"
*Cause: The instance to be removed was the only instance of the
corresponding database that was known to the broker.
*Action: Remove the corresponding database object from the broker
configuration instead of the individual instance object of
the database.

Попробовать перевести

Поискать эту ошибку на форуме