https://bugzilla.wikimedia.org/show_bug.cgi?id=64899
--- Comment #8 from JAn Dudík jan.dudik@gmail.com --- On second computer with same version of pywikibot and python but with Windows 7 there is no problem.
Problem started, when i updated bot by svn - last good version was ca from 20th april.
Replacing files from nightly does not solve problem.
Actually I am not able to run any script from core, because of error with pwb.py