matplotlib / backend

[Pierre]

Hello,

I'm to plot some results but it doesn't work.
I got this error :

/usr/local/libre_rep/python-2.6.1/RHEL_5__x86_64/lib/python2.6/site-
packages/matplotlib/backends/__init__.py:41: UserWarning:
Your currently selected backend, 'agg' does not support show().
Please select a GUI backend in your matplotlibrc file ('/usr/local/
libre_rep/python-2.6.1/RHEL_5__x86_64/lib/python2.6/site-packages/
matplotlib/mpldata/matplotlibrc')
or with matplotlib.use()

Any idea to fix it ?

Thanks