I have installed Python 2.5, PyMUI and PIL 1.1.7 (the last is not required to run helloworld.py script). When I try to run the script, I'm getting the following error:

Work:Dev> python2.5 helloworld.py
Traceback (most recent call last):
File "helloworld.py", line 16, in <module>
win.Notify('CloseRequest', True, lambda e: app.Quit())
File "/Libs/python2.5/site-packages/pymui/_core.py", line 812, in Notify
AssertionError
Work:Dev>

Any ideas what could be causing this? Have I missed something in the installation process? Need some help to get me going with Python...