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when running recent (13.8.2014) core pywikibot through pwb.py I get this error:

Traceback (most recent call last):
  File "pwb.py", line 171, in <module>
    run_python_file(fn, argv, argvu)
  File "pwb.py", line 69, in run_python_file
    exec(compile(source, filename, "exec"), main_mod.__dict__)
  File "scripts\login.py", line 116, in <module>
    main()
  File "scripts\login.py", line 69, in main
    for arg in pywikibot.handleArgs(*args):
  File "C:\Users\JonßÜ\Desktop\Jonas\core\pywikibot\bot.py", line 663, in handleArgs
    init_handlers()
  File "C:\Users\JonßÜ\Desktop\Jonas\core\pywikibot\bot.py", line 245, in init_handlers
    writelogheader()
  File "C:\Users\JonßÜ\Desktop\Jonas\core\pywikibot\bot.py", line 303, in writelogheader
    log(u'  %(name)s (%(path)s) = %(ver)s' % info)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe1 in position 12: ordinal not in range(128)
<type 'exceptions.UnicodeDecodeError'>
CRITICAL: Waiting for 1 network thread(s) to finish. Press ctrl-c to abort

the path is "....Users\Jonáš\Desktop....". Using bot placed in ascii-only characters path solves the issue.