Hello. I am calling a DTML method via a link and inside this method a Z SQL method is called. When this method is called, Zope flags me with a KeyError. The error is as follows: Site Error An error was encountered while publishing this resource. Error Type: KeyError Error Value: 0 Troubleshooting Suggestions This resource may be trying to reference a nonexistent object or variable 0. 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 the error log. If the error persists please contact the site maintainer. Thank you for your patience. The error log gives the following traceback: 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 OFS.DTMLMethod, line 130, in __call__ - <DTMLMethod instance at 3a4f5f0> - URL: http://nameofmachine/edit_data/manage_main - Physical Path: /edit_data Module DocumentTemplate.DT_String, line 474, in __call__ Module DocumentTemplate.DT_In, line 676, in renderwob Module AccessControl.ImplPython, line 161, in guarded_getitem Module AccessControl.ZopeGuards, line 67, in guarded_getitem Module Shared.DC.ZRDB.DA, line 487, in __getitem__ Module Shared.DC.ZRDB.Aqueduct, line 313, in __getitem__ KeyError: 0 edit_data is the DTML method invoked via a link and the name of the Z SQL method is retrieve_names_sql and its definition is as follows: SELECT last_name, first_name, middle_name FROM test WHERE id = <dtml-var "REQUEST.SESSION.get('userId')"> The Z SQL method is called using the following statement: <dtml-call "retrieve_names_sql(REQUEST, _)"> Any help would be greatly appreciated. Thanks. - Asad