Oracle Message RMAN-06028 - duplicate operand specified in restore specification: string

ERRORduplicate operand specified in restore specification: string
CAUSEThe CHANNEL, TAG, FROM, PARMS, VALIDATE, DEVICE TYPE, CHECK READONLY or DB_UNIQUE_NAME option was specified more than once in the restore command or in one of the restore specifications.
ACTIONCorrect and resubmit the command.