I don't use this plugin, but I noticed this with Goodreads Sync and Quality Check. It's an import error, probably something common to various (all?) @Kiwidude's plugins.
This is the error:
Code:
ImportError: cannot import name 'RECOVER_PARSER' from 'calibre.ebooks.oeb.parse_utils'
That's probably related to a recent change in calibre:
https://github.com/kovidgoyal/calibr...eb20a3b800a58c