Oracle Message ORA-19612 - datafile string not restored due to string

ERRORdatafile string not restored due to string
CAUSEThe indicated file could not be restored, because all of its data blocks were not found in the backup piece.
ACTIONThe restore conversation remains active, and the current piece must be re-processed. If the failure cannot be resolved by re-processing the current piece, then the restore conversation must be cancelled.