Oracle Message RMAN-06010 - error while looking up datafile: string

ERRORerror while looking up datafile: string
CAUSEAn error occurred while looking up the specified datafile in the recovery catalog or target database control file.
ACTIONThis error is accompanied by other errors describing the reason for the failure. Ensure that the file name is entered correctly. If the datafile was added recently, then a RESYNC CATALOG must be done to update the recovery catalog.