Message Oracle RMAN-06551 - error while looking up datafile copy for file number: string

ERRORerror while looking up datafile copy for file number: string
CAUSEAn error occurred while looking up the specified datafile copy in the recovery catalog or target database control file.
ACTIONThis error is accompanied by other errors describing the reason for the failure. If the datafile copy was created during a RESTORE with a new name, ensure that the RESTORE completed successfully.