Thanks for your help. I got the issue now. Somehow, Calibre does not longer see my books (at least not most of them). I may have changed the folder or something? It's very odd though as the covers are shown and I can see the metadata. Also when I click "Path - click to open", I am brought to the right folder with the epub inside. Any ideas?
calibre, version 5.21.0
ERROR: Cannot view: xxx has no available formats.
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