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This looks like your version of wstool is the most recent, but rosinstall is not up-to-date. This can happen on Ubuntu in particular if you have an old version of rosinstall in /usr/local/lib/python2.7/dist-packages. Remove anything named rosinstall* or vcstool* in there.
The syntax should be okay, though the added dot as kalectro suggest is also okay, so that might be a workaround. Still you should update.