@davidfor: This is most likely caused by the OP running a distro version of calibre, looking at the debug output, the distro is Arch Linux, which crazily enough decided to release the calibre 2 betas to their user base, as stable, with no testing.
The error will most likely be caused by the fact that the plugin tries to import PyQt4 first and if that fails imports PyQt5. On arch, with a distro package both pyqt4 and pyqt5 are importable, causing the problem.
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