3.48 Calibre implies you are a W7 user.
If you use W8 or W10, why not update Calibre?
Corrupt Database on the Kobo, usually needs the Kobo to rebuild it.
(Your device needs to be connected to the Internet for the steps to work)
If a simple Logoff - Logon did not do it. You may need a full device Reset.
Do wait for a Kobo Expert to speak up.
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