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I was getting the AttributeError: 'NoneType' object has no attribute 'rfind' exception above and pip install Lamson fixed it for me. I saved the dependencies before and after and here is the diff:

$ diff --color requirements_before.txt requirements_after.txt 
5a6
> chardet==2.3.0
20a22
> docutils==0.13.1
24a27
> lockfile==0.12.2
25a29
> MarkupSafe==0.23
26a31
> nose==1.3.7
33a39
> python-daemon==2.1.2