CakeDC's Users plugin action overriding

I have installed CakeDC's Users plugin and I have loaded all the required files in bootstrap.php, as shown below:

CakePlugin::load('Users'); // Loads the Users plugin  CakePlugin::load('Search'); // Loads the Search plugin  CakePlugin::load('Utils'); // Loads the Utils plugin  CakePlugin::load('Users', array('routes' => true));

I would like to override the add() action of the UsersController of the plugin, so I created the AppUsersController.php file in app/Controller, as instructed here:https://github.com/CakeDC/users#extending-the-controller

Then I created an add() action inside the AppUsersController.php, with an empty body, but the original action was not overridden. What am I doing wrong?

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