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That specific error looks like you are missing the six module, but the last line of the traceback:

...
  File "/usr/local/lib/python2.7/dist-packages/dateutil/parser.py", line 24, in <module>
    from six import text_type, binary_type, integer_types
ImportError: No module named six

You can see that the dateutil module is coming from /usr/local/lib/... and everything else is coming from /usr/lib/pymodules/.... This looks like a problem with mixing pip and apt-get. See:

http://answers.ros.org/question/49143/problems-with-rqt-groovy-ubuntu/?answer=49153#post-id-49153