That is a problem reading the database on the device. It usually means the database is corrupt. It can mean there are other issues accessing the device, but, you have checked that.
To fix this, you can restore a recent backup of the database if you have one. Otherwise, you will need to sign out of the Kobo account on the device and then sign in again. This will recreate the database and import any sideloaded books. Unfortunately, you will lose the reading status and annotations for sideloaded books.
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