Oracle Message RMAN-06183 - datafile or datafile copy string (file number string) larger than MAXSETSIZE

ERRORdatafile or datafile copy string (file number string) larger than MAXSETSIZE
CAUSEA BACKUP DATAFILE(copy) command specified the MAXSETSIZE operand too low. The specified datafile is larger than MAXSETSIZE will allow.
ACTIONIncrease MAXSETSIZE limit.