@jmpio: Unfortunately, that says the database on the device is corrupt. Unless you have a backup of the database, you will need to sign out of the Kobo account on the device and back in. This will generate a new database and download any purchased books and reprocess any sideloaded books. The database will be cleared of annotations for sideloaded books, but if there are any annotation files in the "Digital Editions" directory, these will be used when the books are opened.
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