I posted this earlier but after Phil Harris made a few brave attempts to help which were unsuccessful, responses dried up. I am therefore (somewhat cheekily) reposting it: I have been trying to create a site making use of the dtml-tree tag. To get started I tried to follow the "Inplementing a navigation tree" section of the Zbook tutorials. I entered everything more or less exactly as was printed (I made some changes to the HTML output). Everything seems to display correctly when I initially view the page (a tree of my "Outline" folder is displayed), however whenever I click on any of the sub-folders I get the error to be found at the end of this email. Can anyone give me a pointer as to what is going wrong? Also, on a general point - is there any effort being made to make the error reporting system more newbie friendly? Ian. Traceback (innermost last): File /home/zope/Zope/lib/python/ZPublisher/Publish.py, line 214, in publish_module File /home/zope/Zope/lib/python/ZPublisher/Publish.py, line 179, in publish File /home/zope/Zope/lib/python/Zope/__init__.py, line 201, in zpublisher_exception_hook (Object: ElementWithAttributes) File /home/zope/Zope/lib/python/ZPublisher/Publish.py, line 165, in publish File /home/zope/Zope/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: main) File /home/zope/Zope/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: main) File /home/zope/Zope/lib/python/OFS/DTMLDocument.py, line 166, in __call__ (Object: main) File /home/zope/Zope/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: main) File /home/zope/Zope/lib/python/OFS/DTMLMethod.py, line 141, in __call__ (Object: standard_html_header) File /home/zope/Zope/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: standard_html_header) File /home/zope/Zope/lib/python/OFS/DTMLDocument.py, line 162, in __call__ (Object: ll_menu) File /home/zope/Zope/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: ll_menu) File /home/zope/Zope/lib/python/TreeDisplay/TreeTag.py, line 151, in render (Object: Outline) AttributeError: __call__ -- Ian Clarke Email: I.Clarke@strs.co.uk Homepage: http://www.gnu.demon.co.uk/ Also see: http://freenet.on.openprojects.net/ "All we see and all we seem is but a dream within a dream"