[Zope-CMF] How do i fix this error?

[Braun Brelin]

Hello,

I've created an archetype content type that inherits from the
CMFDefault.NewsItem class.  At least that's what I want to have happen,
but I get the following error when I start zope:

AttributeError: 'Products.CMFDefault.NewsItem' module has no attribute
'__module__'


How do I get around this problem? 

Thanks,

Braun Brelin