That error means the database on the device is corrupted. It means that the driver cannot open the database properly to read it. Until this is fixed, calibre will not be able to do anything with the device. And, it will also mean problems when using the device. These problems will usually be losing the reading status of books, or books disappearing and being reimported each time the device is disconnected from the PC as it cannot update the database. These problems are most noticeable after restarting the device as it as any information it can read from the database will be from before when the corruption happened.
The solution is to sign out of the Kobo account on the device. This will rebuild the database from scratch and reimport the books from the device. Unfortunately, you will lose the reading status of any sideloaded books.
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