Sorry for the repost, but I'm lost, and really need to solve this problem... When trying to move Data.fs from Zope 2.10 to 2.13, I first ran into the "version problem", but I successfully stripped versions out of my Data.fs (thanks to this mailing list). Now Zope starts up properly and displays the manage page, but when I try to access the various folders of the site, I get the error below. Any ideas about how to overcome this? How have others convrted their data? Should I move Data.fs in small stepss from 2.10 to 2.11, then to 2.12, and then to 2.13? Is this a common compatibility issue, or some other error in Data.fs? Any help would be greatly appreciated! Thanks, Frank Zope Error Zope has encountered an error while publishing this resource. Error Type: TypeError Error Value: (', use Persistence.Persistent.__new__()', , ()) Traceback (innermost last): Module ZPublisher.Publish, line 126, in publish Module ZPublisher.mapply, line 77, in mapply Module ZPublisher.Publish, line 46, in call_object Module Shared.DC.Scripts.Bindings, line 322, in __call__ Module Shared.DC.Scripts.Bindings, line 359, in _bindAndExec Module App.special_dtml, line 185, in _exec Module DocumentTemplate.DT_Let, line 77, in render Module DocumentTemplate.DT_In, line 647, in renderwob Module DocumentTemplate.DT_In, line 772, in sort_sequence Module ZODB.Connection, line 860, in setstate Module ZODB.Connection, line 914, in _setstate Module ZODB.serialize, line 612, in setGhostState Module ZODB.serialize, line 605, in getState Module ZODB.broken, line 106, in __new__ TypeError: ('object.__new__(Args) is not safe, use Persistence.Persistent.__new__()', <class 'Shared.DC.ZRDB.Aqueduct.Args'>, ())