[Zope] TypeError: Cache values must be persistent objects.

[Nikko Wolf]

Help!

I'm trying to develop a filesystem-based Product (here 'ABCD') and 
unless I remove the "ABCD" folder from my Products directory, I get the 
following error IN THE MANAGEMENT INTERFACE.

Is it possible to determine what's causing the problem?  After multiple 
restarts, I did a global "Find" in the ZMI and (I think) deleted all 
objects of type "ABCD Content".  But still the problem persists (no pun 
intended).

Gaah!  How can I fix this?

===== event.log contains ==========
2005-06-21T14:57:17 ERROR(200) ZODB Couldn't load state for 0x28b5
Traceback (most recent call last):
   File "/usr/local/zope/lib/python/ZODB/Connection.py", line 600, in 
setstate
     self._set_ghost_state(obj, p)
   File "/usr/local/zope/lib/python/ZODB/Connection.py", line 639, in 
_set_ghost_state
     state = unpickler.load()
   File "/usr/local/zope/lib/python/ZODB/Connection.py", line 227, in 
_persistent_load
     self._cache[oid] = object
TypeError: Cache values must be persistent objects.


========== FROM THE =============================
Traceback (innermost last):
   Module ZPublisher.Publish, line 101, in publish
   Module ZPublisher.mapply, line 88, in mapply
   Module ZPublisher.Publish, line 39, in call_object
   Module Shared.DC.Scripts.Bindings, line 306, in __call__
   Module Shared.DC.Scripts.Bindings, line 343, 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 600, in setstate
   Module ZODB.Connection, line 639, in _set_ghost_state
   Module ZODB.Connection, line 227, in _persistent_load
    - __traceback_info__: ('\x00\x00\x00\x00\x00\x009^', 
('Products.ABCD.XML_File', 'XML_File'))
TypeError: Cache values must be persistent objects.
=============================
Plone version: 2.0.5
Zope version: (Zope 2.7.6-final, python 2.3.4, linux2)
Apache version:
CMF version (if known): CMF-1.4.7
Browser(s) and version(s): Mozilla/5.0 (X11; U; Linux i686; en-US; 
rv:1.7.8) Gecko/20050511
Operating system: linux2
Python version: 2.3.4 (#1, Feb  2 2005, 12:11:53)
[GCC 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)]
Debug mode: Yes
=============================
ABCD 0.4
ATExtensions 0.6 installed
Archetypes 1.3.3-final installed
BTreeFolder2 BTreeFolder2-1.0.1
CMFActionIcons 0.9 installed
CMFCalendar CMF-1.4.7 installed
CMFCore CMF-1.4.7
CMFDefault CMF-1.4.7
CMFFormController 1.0.4 installed
CMFMember 1.0.1 installed
CMFPlone 2.0.5
CMFQuickInstallerTool 1.5.1
CMFTopic CMF-1.4.7
CMFTutorial 0.1.2
CompositePage CompositePage-0.2
DCWorkflow CMF-1.4.7
Epoz 0.8.5 installed
ExternalEditor 0.8
ExternalMethod External Method-1-0-0
FlexibleTopic 1.1 installed
Formulator Formulator 1.6.2
GroupUserFolder 2.0.1 installed
Lesson 0.1
LocalFS LocalFS-1-7-andreas
MIMETools
MailHost MailHost-1-3-0
MimetypesRegistry 1.3.3-final05 installed
Minimal 0.1
MySite 0.4 installed
OFSP OFSP-1-0-0
OpenFlow 1.1.0
PageTemplates PageTemplates-1-4-0
PlacelessTranslationService 1.0
PloneCollectorNG 1.2.6 installed
PloneErrorReporting 0.11 installed
PluginIndexes
PortalTransforms 1.3.4-final installed
PythonScripts PythonScripts-2-0-0
Sessions
SiteAccess SiteAccess-2-0-0
SiteErrorLog
StandardCacheManagers StandardCacheManagers-1-1-0
TemporaryFolder
Transience
ZCTextIndex
ZCatalog ZCatalog-2-2-0
ZGadflyDA
ZODBMountPoint
ZReST 1.1
ZSQLMethods
ZopeTutorial Zope Tutorial 1.2
generator 1.3.0-final17
mxmCounter 1.1.0
validation 1.3.2-final