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Difficult for me to debug, then. I just updated my Calibre to 6.10 and the plugin still works without issues. Can you try reinstalling Calibre just in case something is messed up with your installation? And/or try the portable version so it uses a clean new config.
I did look around the calibre source code at the place mentioned in the traceback, that seems unlikely to be an issue caused by my plugin.
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