> Unhandled exception: <b>KeyError</b>:'cardName'
cardName should contain your library card number, so Libby must not be sending your details back correctly.
Can you first check everything looks OK when you log into the website and view library and card details at
https://libbyapp.com/interview/menu#mainMenu
If everything looks correct there, can you try running the plugin in debug (Ctrl-Shift-R should restart Calibre in debug mode) and then exit and look at the generated log file.
When the plugin attempts to sync it should return a response like
[overdrive_libby/0.2.2] RESPONSE: 200
https://sentry.libbyapp.com/chip/sync
and then a few lines further down the actual data which should contain the details of your library cards and usually starts something like.
Quote:
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[overdrive_libby/0.2.2] RES BODY: {"result":"synchronized","cards":[{"cardId":"12345678","cardName":"1234567890123","c reateDate":"2025-01-24T13:42:01+00:00" ...
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This might give a clue about what is going wrong.