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open the book with Calibre Editor, select Tools > Fix HTML - all files followed by Tools > Beautify all files, save the epub and re-run the EpubCheck plugin.
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This didn't help, and it could not, since this problem even occurs with books that I know to be 100% error-free.
I did not try to fix the plugin's main.py, since I used the epubcheck plugin in the version 4.26 for some years and never got such a crash. I suppose there is something new in Windows 11 that was no problem in Windows 10 all these years...