Undefined property: QuestionsController::$Session

Hi to all, I'm newer to CakePHP and i'm reading this book 'packt
publishing cakephp application development'.
I'm running into a problem where my controllers don't seem to be
inheriting from my AppController or someone else.
This is my code

app_controller.php
<?php
class AppController extends Controller {

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

function beforeFilter(){
$this->Auth->loginRedirect = array('controller' => 'questions',
'action' => 'home');
$this->Auth->logoutRedirect = array('controller' => 'questions',
'action' => 'home');
$this->Auth->allow('signup', 'confirm', 'home', 'show');
$this->Auth->authorize = 'controller';
$this->Auth->userScope = array('User.confirmed' => '1');
$this->set('loggedIn', $this->Auth->user('id'));

$this->Auth->autoRedirect = false;
$this->Cookie->name = 'QuickWall';

if(!$this->Auth->user('id')) {
$cookie = $this->Cookie->read('User');
if($cookie) {
$this->Auth->login($cookie);
}
}

}

function isAuthorized() {
return true;
}

}
?>

users_controller.php
......
if ($this->Email->send()) {
$this->Session->setFlash('Confirmation mail sent. Please
check your inbox');
$this->redirect(array('controller' => 'questions',
'action'=>'home'));
} else {
$this->User->del($this->User->getLastInsertID());
$this->Session->setFlash('There was a problem sending the
confirmation mail. Please try again');
}
} else {
$this->Session->setFlash('There was an error signing up. Please,
try again.');
$this->data = null;
}
}
}

questions_controller.php
<?php
class QuestionsController extends AppController {

var $name = 'Questions';

function home() {

if (!empty($this->data) && $this->Auth->user('id')) {
$this->data['Question']['user_id'] = $this->Auth->user('id');
$this->Question->create();
if ($this->Question->save($this->data)) {
$this->Session->setFlash('Your Question has been added');
$this->redirect(array('action'=>'home'), null, true);
} else {
$this->Session->setFlash('The Question could not be saved. Please,
try again.');
}
}

$this->Question->recursive = 1;
$this->set('questions', $this->Question->find('all'));
}

When I try to sign up or to post a question I received this error

Notice (8): Undefined property: QuestionsController::$Session [APP/
controllers/questions_controller.php, line 12]
Fatal error: Call to a member function setFlash() on a non-object in /
web/htdocs/www.endlesslab.org/home/quickwall/app/controllers/
questions_controller.php on line 12

as you can see in http://www.endlesslab.org/quickwall/

Someone can help me please?

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