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This plugin is abandoned now. First it stopped working in Calibre versions based on python2 (calibre < 5.0). And although it installed fine and did not throw any error, it was useless as it was not downloading any metadata since the site changed, and the plugin was not updated to keep up with these changes.
Consequently, it was not ported to use python3 based calibre versions (calibre5). So in those versions it throws the error you just posted. Porting it to python3 will only stop that error, but the plugin will not function.
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