@Glasofruix; this points to a corrupted database on the Touch. Unfortunately, the only real way to fix it is to drop the database which will mean reloading content.
Two ways to drop it
- Factory Reset. This will then mean reinstalling the firmware. This option is found under Settings | Device Information | Factory Reset
- Logging out from Kobo Account. With this there will be no need to reinstall firmware. This option is found under Settings | Account | Sign Out