Back up fails with error code 1

Hi I have a stored CBU job which I back up .pst files. I need to read the files if they have been left open and selected the RAW read option but the job fails with Error Code 1. I cannot find anything on the forums for code 1 and your list of codes doesn`t include it either.

Can you help




This error is an internal error.
Do you have the same error is using VSS option?
Please post a screenshot or the log with error.