Simple Authentication and Authorization Application

Hi guys,... I'm trying to setup new  Simple Authentication and Authorization Application by the book and having a problem 

Notice (8): Undefined property: UsersController::$request [APP/controllers/users_controller.php, line 39]  

Code

    public function add() {            if ($this->request->is('post')) { 

what am I doing wrong????? 

can anyone help,... 

thanks 

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