It definitely sounds like you're using some of the updated plugin launcher files with Sigil v0.8.1.
I just checked and the plugin will work with a stock version of Sigil 0.8.1 or a stock version of 0.8.2.
If you updated some of those launcher files (as bug fixes were coming out), you should probably just update to a stock version of Sigil 0.8.2.
The released version of the plugin worked OK for me on your attached epub using Sigil 0.8.2.
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