That PI has not been touched since 2020 Nov
It is way out of date, Calibre switched to PY5 years ago. Some folk had the skills to make abandoned (for whatever cause) PI, compatible.
Maybe some nice person will update it.
Meanwhile, you might Uninstall it so as to not trip errors. (Rightclick the plugin name in Get Plugins: installed: Remove Plugin
AFAIK this leaves the configuration (if any) for later use.
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