10.2 Simple Acl controlled Application tutorial problem

Hi everyone, I'm doing the cakephp.org acl tutorial and I'm stuck in
the section

10.2.6 An Automated tool for creating ACOs link:http://
book.cakephp.org/view/647/An-Automated-tool-for-creating-ACOs

there is a function that suppose to add acos based on the controllers
or something like that, when i run that function on the browser i get
the following error:

Fatal error: Call to undefined method App::objects() in C:\wamp\www
\cakeacl\controllers\groups_controller.php on line 78

I really appreciate if anyone can help me with this. thank you all in
advance

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