UnicodeEncodeError: 'ascii' codec can't encode character

[GoogleCodeExporter]

I downloaded the version 0.9.3 and I got this log when i run currentcost.exe so 
i cant execute it.

Traceback (most recent call last):
  File "currentcost.py", line 38, in <module>
  File "pylab.pyc", line 1, in <module>
  File "matplotlib\pylab.pyc", line 247, in <module>
  File "matplotlib\pyplot.pyc", line 78, in <module>
  File "matplotlib\backends\__init__.pyc", line 25, in pylab_setup
  File "matplotlib\backends\backend_tkagg.pyc", line 7, in <module>
  File "Tkinter.pyc", line 38, in <module>
  File "FixTk.pyc", line 60, in <module>
  File "os.pyc", line 420, in __setitem__
UnicodeEncodeError: 'ascii' codec can't encode character u'\xed' in position 
40: ordinal not in range(128)

I tryed running as admin and with compability XP SP2 and more but nothing.

How can i solve it?

Thanks in advance!

Original issue reported on code.google.com by barrosol...@gmail.com on 3 Apr 2013 at 7:17