In problem set 5 in programming 2011 first when I run the ps5.py I get this:'Unhandled exception in thread started by ' . What's the problem???

Question

In problem set 5 in programming 2011 first when I run the ps5.py I get this:'Unhandled exception in thread started by <function main_thread at 0x241f930>' . 
What's the problem???

e.mccormick · Answer

Well, what did you do to the file?  What did you add to it?

e.mccormick · Answer

Oh, and what version of Python are you using?

anonymous · Answer

It's version 2.5 and I didn't do nothing.

e.mccormick · Answer

Hmmm... If the file is meant to run without changes, then it would be something not being in the correct path or something else that can cause an unhandled exception.  If the program is not complete, like many of the given .py files, then it could be some missing bit.