[Zope-CMF] Problem installing Plone

[Mehrdad Oveisi]

Hello All,
I have a problem installing Plone.  I have two computers (one is server),
and I can install Plone on one of them and not on the other!  I do very
same thing on both: from scratch install Zope, CMF, and then Plone.  
On the problematic box, it looks as if Plone installs fine, but I cannot
view it. After I click on the View tab there is a zope error which I copied
and pasted at the end.  

Any help is appreciated,
Mehrdad

-----------------------------------
Zope Error

Zope has encountered an error while publishing this resource.

Error Type: AttributeError
Error Value: __getitem__

Troubleshooting Suggestions

    * The URL may be incorrect.
    * The parameters passed to this resource may be incorrect.
    * A resource that this resource relies on may be encountering an error.

For more detailed information about the error, please refer to the HTML
source for this page.

If the error persists please contact the site maintainer. Thank you for
your patience.

Powered by Zope

Traceback (innermost last):
  File /usr/local/zope/Zope-2.5.1b1/lib/python/ZPublisher/Publish.py, line
150, in publish_module
  File /usr/local/zope/Zope-2.5.1b1/lib/python/ZPublisher/Publish.py, line
114, in publish
  File /usr/local/zope/Zope-2.5.1b1/lib/python/Zope/__init__.py, line 159,
in zpublisher_exception_hook
    (Object: TestCMF)
  File /usr/local/zope/Zope-2.5.1b1/lib/python/ZPublisher/Publish.py, line
98, in publish
  File /usr/local/zope/Zope-2.5.1b1/lib/python/ZPublisher/mapply.py, line
88, in mapply
    (Object: index_html)
  File /usr/local/zope/Zope-2.5.1b1/lib/python/ZPublisher/Publish.py, line
39, in call_object
    (Object: index_html)
  File /usr/local/zope/Zope-2.5.1b1/Products/CMFCore/PortalContent.py, line
160, in __call__
    (Object: index_html)
  File /usr/local/zope/Zope-2.5.1b1/Products/CMFCore/utils.py, line 110, in
_getViewFor
    (Object: index_html)
  File /usr/local/zope/Zope-2.5.1b1/lib/python/OFS/Traversable.py, line
163, in restrictedTraverse
    (Object: index_html)
  File /usr/local/zope/Zope-2.5.1b1/lib/python/OFS/Traversable.py, line
148, in unrestrictedTraverse
    (Object: index_html)
AttributeError: (see above)

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