Hi all, I've got the Beehive tutorial on Zclasses and thought I'd try it out on a 2.2.0 system we have here. I have 'create constructor types' and 'nclude standard Zope persistent object base classes? ' set. I've tried selecting various Base Classes (and no base classes), but get the following traceback. <!-- Error type: Could not load oid À, pickled data in traceback info may contain clues Error value: None --> <!-- end of bodytext area --> </body> </html> <!-- Traceback (innermost last): File /home/zope/Zope-2.2.0/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /home/zope/Zope-2.2.0/lib/python/ZPublisher/Publish.py, line 187, in publish File /home/zope/Zope-2.2.0/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: ElementWithAttributes) File /home/zope/Zope-2.2.0/lib/python/ZPublisher/Publish.py, line 171, in publish File /home/zope/Zope-2.2.0/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: manage_addZClass) File /home/zope/Zope-2.2.0/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: manage_addZClass) File /home/zope/Zope-2.2.0/lib/python/ZClasses/ZClass.py, line 154, in manage_addZClass (Object: ElementWithAttributes) File /home/zope/Zope-2.2.0/lib/python/OFS/ObjectManager.py, line 260, in _setObject (Object: ElementWithAttributes) File /home/zope/Zope-2.2.0/lib/python/ZClasses/ZClass.py, line 421, in manage_afterAdd (Object: bookclass) File /home/zope/Zope-2.2.0/lib/python/ZClasses/ZClass.py, line 374, in _register (Object: bookclass) File /home/zope/Zope-2.2.0/lib/python/ZODB/Connection.py, line 447, in setstate File /home/zope/Zope-2.2.0/lib/python/ZODB/Connection.py, line 213, in _persistent_load (Info: À) File /home/zope/Zope-2.2.0/lib/python/ZODB/Connection.py, line 154, in __getitem__ (Info: ('\000\000\000\000\000\000\014\300', '(cExtensionClass\012ExtensionClass\012q\001(U\006ZDItemq\002(cZClasse s.ZClass\012PersistentClass\012q\003cProducts.ZDBase.ZDiscussions\012Z DItem\012q\004cOFS.SimpleItem\012SimpleItem\012q\005tq\006}q\007(U\004 iconq\010UWControl_Panel/Products/ZDiscussions/ZDTopic/propertysheets/ methods/ZDItem%20/ziconImageq\011U\012_p_changedq\012K\001U\007__doc__ q\013U\021ZDiscussions Itemq\014U\006_p_oidq\015U\010\000\000\000\000\000\000\002Lq\016U\011m eta_typeq\017U\021ZDiscussions Itemq\020U\016propertysheetsq\021(U\010\000\000\000\000\000\000\014\30 3q\022(NU\010\000\000\000\000\000\000\014\277q\023Qttq\024QU\011replyF ormq\025cZClasses.Method\012MW\012q\026NRq\027}q\030U$_ZClassMethodPer missionMapperMethod_q\031(U\010\000\000\000\000\000\000\014\304q\032(U \016OFS.DTMLMethodq\033cOFS.DTMLMethod\012DTMLMethod\012q\034ttq\035Qs bU\012index_htmlq\036h\026NRq\037}q h\031(U\010\000\000\000\000\000\000\014\305q!(h\033h\034ttq"QsbU\ 016manage_optionsq#(}q$(U\005labelq%U\010Securityq&U\006actionq\'U \015manage_accessq(u}q)(h%U\004Viewq*h\'U\012index_htmlq+u}q,(U\005lab elq-U\012Propertiesq.U\006actionq/U\025manage_propertiesFormq0utq1U\01 2ziconImageq2(U\010\000\000\000\000\000\000\014\306q3(U\011OFS.Imageq4 cOFS.Image\012Image\012q5tq6tq7QU\022__ac_permissions__q8)U\011_p_seri alq9U\010\003/\363\246\016\005\353\325q:U\012__module__q;U\031*73biqpA I2QDa2iKPitv57g==q<utq=t.N.')) Could not load oid À, pickled data in traceback info may contain clues: (see above) --> Thing is, I've deleted the ZDiscussions and ZBase products as well as packing the database - these products shouldn't be there.... Anyone got any ideas? ta tone ------ Dr Tony McDonald, FMCC, Networked Learning Environments Project http://nle.ncl.ac.uk/ The Medical School, Newcastle University Tel: +44 191 222 5888 Fingerprint: 3450 876D FA41 B926 D3DD F8C3 F2D0 C3B9 8B38 18A2