Rule of ePub and Calibre plugins...
If you run a Calibre plugin on an ePub and you get an error message, run the ePub through epubcheck and the eBook checker in the eBook editor to see if its a problem with the ePub or the plugin.
The plugins require a structurally correct ePub and if they get ePub that's not correct, you can get error(s) with the plugin.
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