https://bugzilla.wikimedia.org/show_bug.cgi?id=55131
--- Comment #1 from Kunal Mehta (Legoktm) legoktm.wikipedia@gmail.com --- in config.datafilepath(*filename), os.path.join(base_dir, *filename) fails if: -. at least one of the argument of os.path.join() is unicode and -. at least one of the argument of os.path.join() has non-ASCII char