Call to undefined method AuthComponent::authorize()

I'm following this guide to setup an ACL:
http://book.cakephp.org/view/648/Setting-up-permissions

When I run my code though I get this error:
Fatal error: Call to undefined method AuthComponent::authorize() in C:
\Development\Projects\LinkBuilder\cake\trunk\app\app_controller.php on
line 8

The code is:

<pre><?php

class AppController extends Controller {

var $components = array("Auth","Acl");

function beforeFilter() {
$this->Auth->authorize("actions");
$this->Auth->loginAction = array(
'admin' => false,
'controller' => 'people',
'action' => 'login'
);
$this->Auth->logoutRedirect = array(
'controller' => 'users',
'action' => 'login'
);
$this->Auth->loginRedirect = array(
'controller' => 'posts',
'action' => 'add'
);
}

}

?></pre>

I've got CakePHP version 1.2.4.8284

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