Well...either way, your gbpvr.mdb file sounds like it is not compatible with the current release. Easiest way to correct the issues is by deleting your gbpvr.mdb file to have it recreate an empty database.
I've just encountered the same problem on a system that's been running (untouched) a couple of months. It failed during scheduled updates, and I just tried to run updates from the command line a couple of times with the same error.
I then logged into labs.zap2it.com to verify everything was ok (it was). I removed about a third of the 400 channels and updated the guide.
I went back into config and performed the epg update and it worked without the error. I then realized I had changed two things at once (the zap2it channel listing and ran from the config gui instead of the command line) -- sorry.
A subsequent update from the command line ran without error.