[Zope] 'NoneType' object has no attribute 'setHeader'

[Christopher Rivard]

Hello,

I am revisiting a product based on the tutorial in the Zope bible and am 
having some issues installing it on Zope 2.7.
It was working in Zope 2.5. Any suggestions of where to start looking to 
solve the following issue?

Traceback (innermost last):
  Module ZPublisher.Publish, line 100, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 40, in call_object
  Module Shared.DC.Scripts.Bindings, line 306, in __call__
  Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec
  Module App.special_dtml, line 175, in _exec
  Module Shared.DC.Scripts.Bindings, line 320, in __render_with_namespace__
  Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec
  Module App.special_dtml, line 175, in _exec
  Module DocumentTemplate.DT_Util, line 201, in eval
   - __traceback_info__: RESPONSE
  Module <string>, line 0, in ?
AttributeError: 'NoneType' object has no attribute 'setHeader'


Thanks in advance,
Chris