[6.0.1] Fetchmail error

Hello,
I just tried to configure an email account to retrieve emails from openerp. When I click on 'get the emails', I get the following error :

Environment Information :
System : Windows-XP-5.1.2600-SP3
OS Name : nt
Operating System Release : XP
Operating System Version : 5.1.2600
Operating System Architecture : 32bit
Operating System Locale : fr_CH.cp1252
Python Version : 2.5.2
OpenERP-Client Version : 6.0.1
Last revision No. & ID :Bazaar Package not Found !Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/service/web_services.py", line 599, in dispatch
    res = fn(db, uid, *params)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/addons/fetchmail/fetchmail.py", line 152, in button_fetch_mail
    self.fetch_mail(cr, uid, ids, context=context)
  File "/usr/local/lib/python2.6/dist-packages/openerp-server/addons/fetchmail/fetchmail.py", line 204, in fetch_mail
    logger.notifyChannel(server.type, netsvc.LOG_WARNING, '%s' % (e))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 1: ordinal not in range(128)