Probleme python 2.4 et matplotlib : unicode encode error

Quelqu'un pourrait-il m'aider à déchiffrer le message d'erreur suivant ?
Sachant que je suis sous windows XP avec python 2.4, Numeric 23.8 et matplotlib 0.81 d'installés.

Code:

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>>> from pylab import *
 
Traceback (most recent call last):
  File "<pyshell#0>", line 1, in -toplevel-
    from pylab import *
  File "C:\Python24\Lib\site-packages\pylab.py", line 1, in -toplevel-
    from matplotlib.pylab import *
  File "C:\Python24\Lib\site-packages\matplotlib\pylab.py", line 195, in -toplevel-
    from axes import Axes, PolarAxes
  File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 14, in -toplevel-
    from axis import XAxis, YAxis
  File "C:\Python24\Lib\site-packages\matplotlib\axis.py", line 21, in -toplevel-
    from font_manager import FontProperties
  File "C:\Python24\Lib\site-packages\matplotlib\font_manager.py", line 982, in -toplevel-
    fontManager = FontManager()
  File "C:\Python24\Lib\site-packages\matplotlib\font_manager.py", line 826, in __init__
    rebuild()
  File "C:\Python24\Lib\site-packages\matplotlib\font_manager.py", line 819, in rebuild
    self.ttfdict = createFontDict(self.ttffiles)
  File "C:\Python24\Lib\site-packages\matplotlib\font_manager.py", line 454, in createFontDict
    font = ft2font.FT2Font(str(fpath))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xae' in position 28: ordinal not in range(128)