ORA-27211: Failed to load Media Management Library

Not sure how to fix this in the configuration ?

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RMAN> show all;

RMAN configuration parameters for database with db_unique_name DWF are:

CONFIGURE RETENTION POLICY TO REDUNDANCY 1;

CONFIGURE BACKUP OPTIMIZATION ON;

CONFIGURE DEFAULT DEVICE TYPE TO 'DISK';

CONFIGURE CONTROLFILE AUTOBACKUP ON;

CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '+DWX_FLASH/DWF/backup/controlfile/ctlfile_autobackup%F';

CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE SBT_TAPE TO '%F'; # default

CONFIGURE DEVICE TYPE DISK PARALLELISM 4 BACKUP TYPE TO BACKUPSET;

CONFIGURE DEVICE TYPE 'SBT_TAPE' BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 1;

CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1;