Message Oracle RMAN-06081 - error reading datafile header for datafile string, code string

ERRORerror reading datafile header for datafile string, code string
CAUSEX$KCVFH returned the specified code in the HXERR column when it was queried for the specified datafile.
ACTIONEnsure the datafile exists and is readable. Using a newer release of Recovery Manager may return a more meaningful error message. If you have no newer version of Recovery Manager, contact Oracle Customer Support.