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What those message mean is that the SQLite database on your Kobo has issues. If you do a search on these forums, you can find several threads on this issue.
Probably, the easiest way to fix the issue is to sign out and then sign back in on your Libre H2O which will create a blank database and then re-import your sideloaded books. You will lose your reading stats, etc.
Not much help to you at this time but davidfor's Kobo Utilities plugin for calibre has the capability of doing a backup of the database and other important information when you connect your Kobo to your computer (the backup is done once per day and saves 5 days by default). This does minimize your losses when your database gets corrupted.
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