[Zope-CMF] have problem with plone install

[Zhou Zhen]

hi, all
I had follow the process what plone.org descripted: install Zope 2.5.0, 
install CMF 1.2, plone 0.99 preview 5, and I add CMF site, in this site 
I add extensal method, final I got the below error message, I couldn't 
solve it by myself anyway.

Any help will be welcome.

Zhou Zhen


    Site Error

An error was encountered while publishing this resource.

*ImportError*

Sorry, a site error occurred.

Traceback (innermost last):
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 150, in publish_module
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 114, in publish
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/Zope/__init__.py, line 158, in zpublisher_exception_hook
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 98, in publish
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/mapply.py, line 88, in mapply
    (Object: manage_addExternalMethod)
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/ZPublisher/Publish.py, line 39, in call_object
    (Object: manage_addExternalMethod)
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/Products/ExternalMethod/ExternalMethod.py, line 59, in manage_addExternalMethod
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/Products/ExternalMethod/ExternalMethod.py, line 107, in __init__
    (Object: install_plone)
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/Products/ExternalMethod/ExternalMethod.py, line 130, in manage_edit
    (Object: install_plone)
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/Products/ExternalMethod/ExternalMethod.py, line 137, in getFunction
    (Object: install_plone)
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/App/Extensions.py, line 145, in getObject
    (Info: ('/usr/local/Zope-2.5.0-linux2-x86/lib/python/Products/CMFPlone/Extensions/Install.py', 'CMFPlone.Install'))
  File /usr/local/Zope-2.5.0-linux2-x86/lib/python/Products/CMFPlone/Extensions/Install.py, line 21, in ?
ImportError: cannot import name cmfplone_globals

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