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This also happens when python-vcstools is at an older version than python-rosinstall. Just updating both should solve this. The error message will be changed soon.

Do not mix apt-get installs with easy_install/pip stuff. Please remove all vcstools from /usr/local/lib/..., because it interferes with the apt-get install of python-vcstools.

apt-get installs rosinstall and vcstools to /usr/share/... easy_install/pip install them to /usr/local

If you install both, the binary from /usr/share will attempt to load the libraries from /usr/local, so all kinds of problems occur.