[Zope] Why am I getting "AttributeError: 'NoneType' object has no attribute 'setHeader'"?

[Chris Withers]

FWIW, I've seen this a few times relating to the ZMI, the top frame in 
particular.

I can't remember how I managed to provoke it htough...

Chris

Andreas Jung wrote:

> Please file a Zope collector issue for this.
> 
> -aj
> 
> --On Donnerstag, 6. Januar 2005 23:33 Uhr -0500 Sensible Chaos 
> <amphigory at gmail.com> wrote:
> 
>> Running 2.7.4rc1, I'm getting the following errors in relation to a
>> product I'm building, and can't seem to figure out why.  It appears to
>> me that the dtml method is not getting a RESPONSE object, but I've no
>> idea what could cause that.  Any help would be GREATLY appreciated, as
>> I'm very new to zope and really can't seem to figure this out.
>>
>> Thanks!
>>
>> Patrick
>>
>> ============ Errors:
>>      
>> Site Error
>>
>> An error was encountered while publishing this resource.
>>
>> AttributeError
>> Sorry, a site error occurred.
>>
>> Traceback (innermost last):
>>
>>     * Module ZPublisher.Publish, line 175, in publish_module_standard
>>     * Module ZPublisher.Publish, line 132, in publish
>>     * Module Zope.App.startup, line 204, in zpublisher_exception_hook
>>     * Module ZPublisher.Publish, line 101, in publish
>>     * Module ZPublisher.mapply, line 88, in mapply
>>     * Module ZPublisher.Publish, line 39, 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 198, in eval
>>       __traceback_info__: RESPONSE
>>     * Module <string>, line 0, in ?
>>
>> AttributeError: 'NoneType' object has no attribute 'setHeader' (Also,
>> an error occurred while attempting to render the standard error
>> message.)
>>
>> ==========  Relevant Python Code:
>>     security.declareProtected('View management screens', 'manage_main')
>>     manage_main = DTMLFile("dtml/mainAnnounceIt", globals())
>>
>> ========== DTML Page (dtml/mainAnnounceIt)
>> <dtml-var manage_page_header>
>> <dtml-var manage_tabs>
>>
>> <form method=post action=editAnnounceIt>
>> <table border=0 cellspacing=0 cellpadding=5>
>>  <tr>
>>   <td>Title:</td>
>>   <td><input type=text name="title" value="&dtml-title;"></td>
>>  </tr>
>>  <tr>
>>   <td colspan=2><input type=submit value="Edit Annoucements"></td>
>>  </tr>
>> </table>
>> </form>
>> </body>
>> </html>
>>
>> <dtml-var manage_page_footer>
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> 
> 
> 
> 
> 
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