Did this ever get resolved?
I had similiar problem with a custom Product extending Folder.  Noticed when I commented the following lines of code, the error went away:
    #__roles__ = ()
Thanks for the response Dieter,

On 5 Feb 2004, at 18:51, Dieter Maurer wrote:

> Tony McDonald wrote at 2004-2-5 12:43 +0000:
>> ...
>> We have an index_html (initially DTML document, then tried method)
>> that
>> can be created (located at /prototype/myporfolio/index_html), have
>> it's
>> security settings changed quite happily. Then when the object is
>> called
>> we get the error in the subject line. The system specs are;
>> ...
>> and the traceback is;
>> Traceback (innermost last):
>> ...
>>   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'
> Looks like "RESPONSE" is "None".
> I do not see how this can happen...

Exactly! - this is why I said I'd never seen this before.

It's a 2.6.1 Data.fs that's been dropped into a stock 2.7.0rc2 release
and I get this error.

I have no idea why this is happening, so I was hoping that it was an
artifact of the 2.7.0rc2 release itself.

> Probably, I would start debugging.

Quite likely, but I have *no* idea where to start with this. All the
modules mentioned in the trackback are Zope supplied ones, not third
party ones, so I'd assumed it might be the core software.

> --
> Dieter

once again, thanks for the reply Dieter.

Dr Tony McDonald, Asst Director, FMSC. 0191 245 4223
Project Manager, FDTL-4 ePortfolios http://www.eportfolios.ac.uk/
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