Login issue since yesterday

I try to log with my usual batch file (working since 3 years now and very simple) but i have errors and i didn't understood why it didn't work

The version.py is :
Pywikipedia trunk/pywikipedia/ (r10207, 2012/05/12, 14:06:20)
Python 2.7.2 (default, Jun 12 2011, 14:24:46) [MSC v.1500 64 bit (AMD64)]
config-settings:
use_api = True
use_api_login = True
unicode test: ok

Please find below the error message
C:\Python27\pywikipedia>python interwiki.py -start:! -autonomous -continue
Traceback (most recent call last):
File "interwiki.py", line 2578, in <module>
main()
File "interwiki.py", line 2498, in main
pywikibot.output(u'Reading interwikidump-%s-%s.txt' % (sitename, sitelang))
File "C:\Python27\pywikipedia\wikipedia.py", line 8014, in output
ui.output(text, toStdout = toStdout)
File "C:\Python27\pywikipedia\userinterfaces\terminal_interface_base.py", line
78, in output
codecedText = codecedText.encode(self.transliteration_target, 'replace').dec
ode(self.transliteration_target)
LookupError: unknown encoding: None

C:\Python27\pywikipedia>python login.py -all -pass:----------------------
Traceback (most recent call last):
File "login.py", line 436, in <module>
main()
File "login.py", line 415, in main
pywikibot.output(u'Already logged in on %s' % site)
File "C:\Python27\pywikipedia\wikipedia.py", line 8014, in output
ui.output(text, toStdout = toStdout)
File "C:\Python27\pywikipedia\userinterfaces\terminal_interface_base.py", line
78, in output
codecedText = codecedText.encode(self.transliteration_target, 'replace').dec
ode(self.transliteration_target)
LookupError: unknown encoding: None