[Zope] Can't create ZClass under 2.2.0

[Tony McDonald]

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.

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  Error type:  Could not load oid       À, pickled data in traceback 
info may            contain clues
  Error value: None
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</body>
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<!--
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$_ZClassMethodPer 
missionMapperMethod_q\031(U\010\000\000\000\000\000\000\014\304q\032(U 
\016OFS.DTMLMethodq\033cOFS.DTMLMethod\012DTMLMethod\012q\034ttq\035Qs 
bU\012index_htmlq\036h\026NRq\037}q 
h\031(U\010\000\000\000\000\000\000\014\305q!(h\033h\034ttq&quot;QsbU\ 
016manage_optionsq#(}q$(U\005labelq%U\010Securityq&amp;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&lt;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