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This is strange, I can reproduce the error, but also find that repeating the "python setup.py develop" command takes you past this issue.

There is nothing we can do, one of the dependency modules requires mock library, which normally used only by the developers for testing the code.

Issues like this one may happen from time to time, because dependency modules are pulled from third party sites. It might be possible to set up an alternative module repository as a backup, but we don't have one now.