Ah, Mac OS. Don't have that available for testing.
Doesn't look like it has anything to do with the plugin at least from those lines. Do the ones above it give any further clues.
Typically when faced with this kind of unknown error/crash, I've seen people recommend uninstalling and re-downloading/reinstalling calibre from the calibre web site. Not sure if that would help here or not, but at the moment I don't have any other suggestions.
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