Cannot view the instances after I refresh the product in ZMI

"Alex Cheng" <[email protected]> Tue, 27 Feb 2007 13:16:54 +0800
Newsgroups gmane.comp.web.zope.zope3.user,gmane.comp.web.zope.chinese,gmane.comp.web.zope.general
Message-ID <[email protected]>
Hello,

I have modified my product code and click refresh in ZMI to update the
product. Unfortunately when I view its instance in zope. The error message
is follows:

*Error Type: TypeError*
*Error Value: 'NoneType' object is not callable

Could you help me?

Thanks.
*--
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