Whatever your locale is set to it sounds like this application cannot work with it. You could try this:
$ LC_ALL=en_US.UTF-8 ./bully.py
This sets the locale to `en_US.UTF-8`temporarily just for this application to be able to launch. See this U&L Q&A for more on the subject regarding LC_* variables & localizations
* What does "LC_ALL=C" do?.