Problems with rosrun, rosws and others

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Hi there. I use ROS Fuerte and I have a problem in a computer. When I use rosrun, roscreate-pkg and rosws some errors are happening. I'd like a help from you. For example, when I type: $ rosws init ~/fuerte_workspace /opt/ros/fuerte the console showed:

Traceback (most recent call last):
  File "/usr/bin/rosws", line 52, in <module>
    import rosinstall.rosws_cli
  File "/usr/lib/pymodules/python2.7/rosinstall/__init__.py", line 33, in <module>
    import rosinstall.helpers
  File "/usr/lib/pymodules/python2.7/rosinstall/helpers.py", line 37, in <module>
    from rosinstall.config_elements import SetupConfigElement
  File "/usr/lib/pymodules/python2.7/rosinstall/config_elements.py", line 38, in <module>
    from vcstools.vcs_abstraction import get_vcs_client
  File "/usr/lib/pymodules/python2.7/vcstools/__init__.py", line 43, in <module>
    from vcstools.svn import SvnClient
  File "/usr/lib/pymodules/python2.7/vcstools/svn.py", line 44, in <module>
    import dateutil.parser  # For parsing date strings
  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

Can anyone help me? It is making a lot of problem for me.

Thanks so much!