I am trying to get an old, old product to work in 2.8.4 and I am getting the following error: Traceback (innermost last): Module ZPublisher.Publish, line 113, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 40, in call_object Module Shared.DC.Scripts.Bindings, line 311, in __call__ Module Shared.DC.Scripts.Bindings, line 348, in _bindAndExec Module App.special_dtml, line 175, in _exec Module DocumentTemplate.DT_Let, line 76, in render Module DocumentTemplate.DT_In, line 643, in renderwob Module DocumentTemplate.DT_In, line 771, in sort_sequence Module ZODB.Connection, line 704, in setstate Module ZODB.Connection, line 760, in _setstate Module ZODB.serialize, line 495, in setGhostState Module ZODB.serialize, line 488, in getState Module ZODB.serialize, line 399, in _persistent_load Module ZODB.serialize, line 372, in _get_class Module Zope2.App.ClassFactory, line 29, in ClassFactory Module OFS.Uninstalled, line 61, in Broken File "<string>", line 1 class <class 'ZDTopic_ZPropertySheetsClass'>(BrokenClass): ' '; __module__=None ^ SyntaxError: invalid syntax I know, that it has something to do with the new extension class, but I can't seem to find any documentation on the new classes, how to write them or how to convert old classes? Any pointers? Jake http://www.ZopeZone.com "Zoping for the rest of us"