[Zope-PTK] Can't import DemoPortal.zexp

[Jonathan]

>It looks to me that you haven't installed the ZPatterns product. 
>Try grabbing >the 0.3.0 version, since the 0.4.0 version doesn't 
>have a compatible
>LoginManager product at the moment.
>
>-paul

I got that far in the meanwhile :)  LoginManager, Membership, PTKBase 
and PTKDemo are all installed now, but when I try to import 
'DemoPortal.zexp' it gives me another system error:

   Error Type: SystemError
   Error Value: Failed to import class _ZClass_for_MemberMixin from module
   Products.PTKDemo

Any ideas where I should be looking?

Thnx
Jonathan