[Zope] Weird ZMI error

[Jon Erickson]

When I log into the zope ZMI with...

http://127.0.0.1/manage/

... i recieve the following error and traceback:

-------------------------------------------------------------------------
Error Type: TypeError
Error Value: ('len() of unsized object', , None)

Traceback (innermost last):
  File
/usr/local/src/zope/lib/python/Products/Hotfix_2002-04-15/__init__.py,
line 51, in publish_module
  File /usr/local/src/zope/lib/python/ZPublisher/Publish.py, line 187,
in publish
  File /usr/local/src/zope/lib/python/Zope/__init__.py, line 226, in
zpublisher_exception_hook
    (Object: Zope)
  File /usr/local/src/zope/lib/python/ZPublisher/Publish.py, line 171,
in publish
  File /usr/local/src/zope/lib/python/ZPublisher/mapply.py, line 160, in
mapply
    (Object: manage_main)
  File /usr/local/src/zope/lib/python/ZPublisher/Publish.py, line 112,
in call_object
    (Object: manage_main)
  File /usr/local/src/zope/lib/python/Shared/DC/Scripts/Bindings.py,
line 324, in __call__
    (Object: manage_main)
  File /usr/local/src/zope/lib/python/Shared/DC/Scripts/Bindings.py,
line 354, in _bindAndExec
    (Object: manage_main)
  File /usr/local/src/zope/lib/python/App/special_dtml.py, line 244, in
_exec
    (Object: manage_main)
  File /usr/local/src/zope/lib/python/DocumentTemplate/DT_In.py, line
711, in renderwob
    (Object: objectItems)
  File /usr/local/src/zope/lib/python/DocumentTemplate/DT_In.py, line
839, in sort_sequence
    (Object: objectItems)
  File /usr/local/src/zope/lib/python/ZODB/Connection.py, line 544, in
setstate
TypeError: (see above)
---------------------------------------------------------------------------

The error and traceback appear in the frame that should display the
contents of the root folder.  The frame on the left hand side of the
page correctly displays all the directories.  If I select a folder, it
will display it's contents with no problems... just seems to be a
problem with the root directory.

Any help is appreciated,

Jon