[Zope] ZClasses under Zope 2.5

[Beat Zimmerli]

Hi every body.

I am new to Zope and I am trying to create a ZClass in order to use
automatic cataloging. I am following the Zope book chapter 9 automatic
cataloging. The creation of the ZClas "NewsItem" works fine, as described in
the book under Zope 2.4.3 (running on NT 4). Unfortunately the same ZClass
does not work under Zope 2.5.0 (Windows 2000). If I want to create a new
NewsItem I get an error after having entered an id and clicked on add.

Any one any suggestion?

Thank you very much in advance

Beat Zimmerli