I'll just explain it, but he should edit his post too (and put "Solved" in the title):
He selected "Enable Scripting" in the Application Properties without knowing the difference between Events and Python. He didn't have the Python Libraries installed, so it caused his game to crash.
I think there should be a better warning when someone doesn't have the Python Libraries. Maybe an error message saying that it can't find Python?
Edit: Yeah, it is NOT a bug.