Having exported a ZEXP file from one Zope instance (Zope 2.7.2, Python 2.3.3), I get the following error when trying to import the ZEXP into another Zope instance (Zope 2.6.2, Python 2.1.3). I've never before seen this error, and I'm wondering if anyone can help. Traceback (innermost last): Module ZPublisher.Publish, line 98, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 39, in call_object Module OFS.ObjectManager, line 530, in manage_importObject Module OFS.ObjectManager, line 546, in _importObjectFromFile Module ZODB.ExportImport, line 79, in importFile Module ZODB.Transaction, line 235, in commit Module ZODB.Transaction, line 350, in _commit_objects Module ZODB.Connection, line 305, in commit Module ZODB.ExportImport, line 148, in _importDuringCommit SystemError: Failed to import class struct_time from module time ID:[{20040830095057.711.8301683122-12.6.18.86}]