matplotlib nie działa

"Traceback (most recent call last):
  File "C:\Users\kkalfas\Desktop\program\graph.py", line 1, in <module>
    import matplotlib
  File "C:\Python27\lib\site-packages\matplotlib\__init__.py", line 134, in <module>
    six.__version__))
ImportError: six 1.3 or later is required; you have 1.2.0-mpl"