... I have developped a website under zope 2.5.0, mostly w/ dtml a python scripts. It is based on zclass defined in products (not external products) 3 of them were imported without pbs under Zope 2.6.1, but one of them (that has nothing special), when I import it raises :
Error Type: ImportError Error Value: No module named iclass
A well known problem with a known solution. Please search the mailing list archives to find it.
Yup. This was discussed about a week ago. Search the mailing list archives; but as I remember, only the ZClasses descended from ObjectManager have the problem, and then only if there is a non-empty list on the SubObjects tab. To export from 2.5.x, remove all from that list; then it will import fine into 2.6. Then, I presume that you can recreate the list of allowed subobjects, though I have not tried this.
-- Jim Washington
Worked for me !!