Basically reinstalling with the latest version. This deletes all data, including the broken database. Then installing a new copy should give you a working and up-to-date database. Keep in mind that in doing so your current adverts, stats and related settings will be lost.
I don’t know how the issue started, but looking at the errors you posted so far I think it’s because of the open file limitation, several of the errors mentioned it could not open the database files. But as I said, several of these fields have been added years ago. So, unless the files issue has been going on for some years… no idea.
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