ORA-00238: operation would reuse a filename that is part of the database

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ORA-00238: operation would reuse a filename that is  part of the database
Cause:  The filename supplied as a parameter to the ALTER DATABASE BACKUP
CONTROLFILE command or to cfileSetSnap shotName matches the name of a file
that is currently part of the database.
Action:   Retry the operation with  a different filename.