I began to download and to install PTK's last version recently. I installed the product by following procedure described in the file " Read Me ", and I so obtained three new elements in the section products. But when I try to create a new element "Portal", Zope sends back me an error. I search so the details of the installed products and I notice that in the part " DemoPortal " certain elements are broken: It is a question of: . " DemoPortal / Portal " . " DemoPortal / PortalWizard " . " DemoPortal / Wizard " In fact they are all the DemoPortal's ZClass which are lacking. Can it involve a conflict with another product? Is it necessary to settle PTK on Zope's clean version? I work with: Zope version: Zope 2.1.2 (binary release, python 1.5.2 , win32-x86) on Win NT4 / sp4, as well as with Zope 2.1.4 on Linux Mandrake 7.0. (on whom I did not test PTK because it is my working environment, and I do not wish to pollute it). Thank you for advices. I intervene only rarely. What is well , it is that major subjects and basic questions were approached in depth, repeatedly, what allows to avoid resting the same questions. By getting back this information, the people of the ZDP make a formidable job. That has the taste of object oriented thinking... Greetings Omar RABHI The Old Zope Book in French http://www.zope-france.org:8080/sujets/Documentation/zbook Zope & XML http://www.zope-france.org:8080/sujets/XML/xmlconf Gain Zope Enlightenment By Grokking Object Orientation: http://www.zope-france.org:8080/sujets/Documentation/grokking/