Error - Duplicate GUID Found

I have an issue with a specific file that I have been using, recently it gave me an error (below).

I would like to remove this error from the file. I have made a copy of the file on my c:drive and deleted everything in the file as well as all the pipeline tags that were created and the error still persists. Is there something else I can try to get rid of this error? File included... hopefully it can be viewed.

Kind Regards,

Shaun R

8712.H350997-0000-250-20M-0001.dgn