Getting erro in pylab

I'm getting the following error: from matplotlib.pylab

    > import * File
    > "/usr/lib/python2.4/site-packages/matplotlib/", line
    > 709, in ? figimage.__doc__ = Figure.figimage.__doc__ + """
    > TypeError: unsupported operand type(s) for +: 'NoneType' and
    > 'str' "

    > Any ideas what it might be and how I can get around it?

Any chance you are getting this with a py2exe frozen app?

If I recall correctly, there is an optimize flag in py2exe that
suppresses doc strings. This might explain your problem.

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