restore database validate check logical failed

Hi All,
I have 2-node RAC database version is 11.2.0.3 having oracle linux 6.3

during backup I am getting some alert when i run restore database validate check logical.

i have set backup parameter

CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/backup/AIWPROD/Sun/%n_%F';

CONFIGURE DEVICE TYPE DISK PARALLELISM 8 BACKUP TYPE TO BACKUPSET;

CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT   '/backup/AIWPROD/Sun/%n_%U.bu' MAXPIECESIZE 20 G;

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