Hi all I am getting an error message when i m trying to add product i.e addressbook with security provision(chapter 9 of Zope Bible) in zope 2.7. And i m getting the following error Site Error An error was encountered while publishing this resource. AttributeError Sorry, a site error occurred. Traceback (innermost last): · Module ZPublisher.Publish, line 163, in publish_module_standard · Module ZPublisher.Publish, line 127, in publish · Module Zope.App.startup, line 203, in zpublisher_exception_hook · 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' (Also, an error occurred while attempting to render the standard error message.) 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 error log. If the error persists please contact the site maintainer. Thank you for your patience. so anybody have any solution related to this so please help me....