[Zubersoft]

That actually has nothing to do with your tablet or your library. That is referring to SpinningWheel.dll in the MobileSheetsProCompanion directory. It sounds like, for some reason, the file is either missing or it doesn't like the version of the file present. That dll is used to visualize the progress ring that shows while the application is waiting for the backup to finish. Can you try reinstalling the companion app?

Thanks,
Mike