ACL issue

Please help me resolve this ACL issue. I'm going through the tutorial
"10.2.6 An Automated tool for creating ACOs"
(http://book.cakephp.org/view/647/An-Automated-tool-for-creating-
ACOs)
and getting stuck with the following error message when creating the
ACOs by running the

build_acl():

Fatal error: Call to a member function node() on a non-object in C:
\wamp\www\xchange\app\controllers\users_controller.php on line 92

Awaiting any help you can offer

Thnx,

Sam
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