Message Oracle RMAN-06444 - error creating string

ERRORerror creating string
CAUSEDuring the CREATE CATALOG or UPGRADE CATALOG command, the indicated object could not be created due to errors.
ACTIONMake sure that the RECOVER.BSQ file has not been modified or damaged, and then if this error persists, contact Oracle support. If the error refers to one of the RMAN PL/SQL packages, connect to the recovery catalog owner and query the USER_ERRORS view to find out the details of the compilation errors.