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Every time you get this problem or this happened for first time? Can you run backup again and see if its for the first time.
I ran the backup again and the and the error still persists.
Did you start this instance from SPFILE and then remove that SPFILE? If yes then that is the problem, the backup is trying to backup the SPFILE and failing. Recreate the SPFILE from PFILE.
This answer was helpful. I solved my problem.