Fatal error: Call to undefined method CookieComponent::del()

Hi to all I have this strange error in my code. I want to make a
cookie system with cakephp, and in app_controller.php I include

var $components = array('Auth', 'Cookie'); var $helpers =
array('Html', 'Form', 'Session');

but everytime I click on Logout link the error appears. This is the
function

function logout() {
$cookie = $this->Cookie->read('User');
if($cookie)
$this->Cookie->del('User');
$this->Session->setFlash('Logout');
$this->redirect($this->Auth->logout());
}
Where I can look for a solution? Thank you dude

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