[Zope] KeyError: aq_base

[Shriek@gmx.co.uk]

Have moved one of my sites over from Zope 2.1.6 to 2.4.3. Everything
imported OK but viewing the site causes an error.  What does the following mean ?

Traceback (innermost last):
  File /usr/local/Zope-2.4.3/lib/python/ZPublisher/Publish.py, line 223, in
publish_module
  File /usr/local/Zope-2.4.3/lib/python/ZPublisher/Publish.py, line 187, in
publish
  File /usr/local/Zope-2.4.3/lib/python/Zope/__init__.py, line 226, in
zpublisher_exception_hook
    (Object: CorporateInfo)
  File /usr/local/Zope-2.4.3/lib/python/ZPublisher/Publish.py, line 171, in
publish
  File /usr/local/Zope-2.4.3/lib/python/ZPublisher/mapply.py, line 160, in
mapply
    (Object: index_html)
  File /usr/local/Zope-2.4.3/lib/python/ZPublisher/Publish.py, line 112, in
call_object
    (Object: index_html)
  File /usr/local/Zope-2.4.3/lib/python/OFS/DTMLMethod.py, line 199, in
__call__
    (Object: index_html)
  File /usr/local/Zope-2.4.3/lib/python/DocumentTemplate/DT_String.py, line
546, in __call__
    (Object: index_html)
  File /usr/local/Zope-2.4.3/lib/python/OFS/DTMLMethod.py, line 192, in
__call__
    (Object: standard_html_header)
  File /usr/local/Zope-2.4.3/lib/python/DocumentTemplate/DT_String.py, line
546, in __call__
    (Object: standard_html_header)
  File /usr/local/Zope-2.4.3/lib/python/DocumentTemplate/DT_Util.py, line
231, in eval
    (Object: REQUEST.has_key('lc'))
    (Info: REQUEST)
  File <string>, line 2, in f
    (Object: guarded_getattr)
  File /usr/local/Zope-2.4.3/lib/python/AccessControl/DTML.py, line 101, in
guarded_getattr
    (Object: index_html)
  File /usr/local/Zope-2.4.3/lib/python/AccessControl/ZopeGuards.py, line
122, in guarded_getattr
  File /usr/local/Zope-2.4.3/lib/python/AccessControl/SecurityManager.py,
line 149, in validate
  File /usr/local/Zope-2.4.3/lib/python/AccessControl/ZopeSecurityPolicy.py,
line 119, in validate
  File /usr/local/Zope-2.4.3/lib/python/ZPublisher/HTTPRequest.py, line 897,
in __getitem__
KeyError: aq_base


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