[Zope] First attempt at writing External Method .. need help

[kent@springfed.com]

Howdy,

I wrote the example as in The Zope Book;

file hello.py in Extensions dir

def hello():
=09return "Howdy there big world"

I created a folder testExternalMethods
and added External Method =3D hello ...

It added with no errors, however clicking
on the 'Test' tab of object 'hello' does nothing
and the URL testExternalMethods/hello produces a blank page

What am I missing here?

Thanks,
Kent