I just had a quick look at things - it seems that the Calibre developers have removed the pyPdf package from the Calibre Python distribution. In other words: one of the libraries this plugin relies on is no longer there.
It's a bit awkward - the Calibre changelog doesn't mention any of this. I currently don't have time to redesign the backend of this plugin, so I think you should take a look at the alternatives. The 'noteworks' standalone app (mentioned a few posts back) seems to be a good alternative?
I'm sorry about this.
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