ReflectionException in RegisterListenersPass.php line 101: Class does not exist Symfony 2 -

this first question, have error reflectionexception in registerlistenerspass.php line 101: class acme\examplebundle\handler\authenticationhandler.php not exist. using fosuserbundle , symfony 2.

in services.xml

<service id="login_listener" class="%vixur.login_listener.class%">         <tag name="kernel.event_subscriber"/>      </service> 

authenticationhandler.php:

    <?php   namespace acme\examplebundle\handler;  use fos\userbundle\fosuserevents; use fos\userbundle\event\formevent; use symfony\component\eventdispatcher\eventsubscriberinterface; use symfony\component\httpfoundation\redirectresponse;  /**  * listener responsible change redirection @ end of password resetting  */ class authenticationhandler implements eventsubscriberinterface {     private $container;      public function __construct()     {      }      /**      * {@inheritdoc}      */     public static function getsubscribedevents()     {         return array(             fosuserevents::security_implicit_login => 'onsecurityimplicitlogin',         );     }      public function onsecurityimplicitlogin(formevent $event)     {         $url = $this->router->generate('ex_homepage');         $event->setresponse(new redirectresponse($url));     } } 

thanks!!

are sure namespaces right? because have try follow symfony coding standar (psr-0 , psr-4) , names of folders not rigth. has camelcase.

have check if %vixur.login_listener.class% variable has right value?