ORA-00296: maximum number of files (string ) exceeded for RECOVER DATAFILE LIST

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ORA-00296: maximum number of files (string ) exceeded for RECOVER DATAFILE
LIST
Cause:  The RECOVER DATAFILE LIST command specified more datafiles than
are allowed by the DB_FILES initialization parameter. This error occurs when
doing recovery with Recovery Manager, and the instance has been started with a
DB_FILES parameter specifying fewer datafiles than recovery manager needs to
recover to satisfy the user's RECOVER command.
Action:   Re-start the instance with a higher value for DB_FILES.