Firstly, it is always a good idea to include the actual error messages produced. That will help to tell us where the error is. For example, I don't know if the import if failing, or if it is when you actually call a method from the packages.
Assuming it is the import failing, have these files been included in the zip file for the plugin? From what you have said, I'm not sure whether you have them in the package, or simply put them in the plugin directory of the calibre preferences.
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