Oracle Message RMAN-06424 - error while looking up proxy copy

ERRORerror while looking up proxy copy
CAUSEAn error occurred while looking up the specified proxy copy 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 name or key is entered correctly. If the proxy copy was created when the recovery catalog was not available, then a RESYNC CATALOG must be done to update the recovery catalog.