>>> reference_catalog.lookupObject(uuid='2d5509593d6796d5fb40ce783412611f')
Traceback (most recent call last):
  File "<input>", line 1, in ?
  File "/opt/plone/buildout-cache/eggs/Products.Archetypes-1.5.16-py2.4.egg/Products/Archetypes/ReferenceEngine.py", line 446, in lookupObject
    obj = self._objectByUUID(uuid)
  File "/opt/plone/buildout-cache/eggs/Products.Archetypes-1.5.16-py2.4.egg/Products/Archetypes/ReferenceEngine.py", line 469, in _objectByUUID
    brains = tool(UID=uuid)
  File "/opt/plone/HealWA/parts/zope2/lib/python/Products/ZCatalog/ZCatalog.py", line 663, in searchResults
    return self._catalog.searchResults(REQUEST, used, **kw)
  File "/opt/plone/HealWA/parts/zope2/lib/python/Products/ZCatalog/Catalog.py", line 738, in searchResults
    return self.search(args, sort_index, reverse, sort_limit, _merge)
  File "/opt/plone/HealWA/parts/zope2/lib/python/Products/ZCatalog/Catalog.py", line 477, in search
    r = _apply_index(request)
  File "/opt/plone/HealWA/parts/zope2/lib/python/Products/PluginIndexes/common/UnIndex.py", line 393, in _apply_index
    set=index.get(key, None)
  File "/opt/plone/buildout-cache/eggs/ZODB3-3.8.4-py2.4-linux-x86_64.egg/ZODB/Connection.py", line 808, in setstate
    raise ConnectionStateError(msg)
ConnectionStateError: Shouldn't load state for 0xb8c9 when the connection is closed