Session check problem

hi guys,... 

having a problem to migrate to a new version 2.2.2 

in AppController I have: 

App::uses('Controller', 'Controller', 'CakeEmail', 'Network/Email');

class AppController extends Controller {

  

  static $FLASH_ALLOWED_TYPES = array('error', 'valid', 'notice');

  var $helpers = array('Javascript', 'Ajax', 'User', 'Session', 'App'); 

  var $components = array('Cookie', 'RequestHandler');

  function beforeFilter()

  {

    if($this->Session->check('user'))

      $this->user = $this->Session->read('user');

and it gives me an error 

Fatal error: Call to a member function check() on a non-object in /home/xachkaa/hamayk.com/html/app/Controller/AppController.php on line 139 

can anybody tells me what's wrong with it please ... 

thanks 

  

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