Symfony2 session and PHP SDK 4.0 problems on login

I am trying to integrate Facebook PHP-SDK 4 and Symfony2

I installed Facebook SDK using composer and used basic code from Facebook developer documentation

Create login url

public function indexAction(Request $request) {
        //Generate
        FacebookSession::setDefaultApplication('appId', 'secret');
        $redirectUrl = $this->generateUrl('auth_facebookredirect');
        $helper = new FacebookRedirectLoginHelper($redirectUrl);
        $helper->disableSessionStatusCheck();
        $loginUrl = $helper->getLoginUrl();
        return $this->render('UserBundle:FB:index.html.twig', array('loginUrl'=>$loginUrl));
    }

      

        
        
        
      

    

Callback or Facebook redirect after successful login

public function successAction(Request $request) {
        FacebookSession::setDefaultApplication('appId', 'secret');

        $redirectUrl = $this->generateUrl('auth_facebookredirect');
        $helper = new FacebookRedirectLoginHelper();
        //$session = $helper->getSessionFromRedirect();

        try {
            $session = $helper->getSessionFromRedirect();

        } catch (FacebookRequestException $ex) {
            echo " When Facebook returns an error";
        } catch (\Exception $ex) {            
            echo " When validation fails or other local issues";
        }
        if ($session) {
            $me = (new FacebookRequest(
                    $session, 'GET', '/me'
                    ))->execute()->getGraphObject(GraphUser::className());
            var_dump($me);
        }
        return $this->render('UserBundle:FB:success.html.twig', array());
    }

      

        
        
        
      

    

At first I got the error

FacebookSDKException: Session not active, could not store state.

I came across this link and it says there is a session problem and is using

$helper->disableSessionStatusCheck();

because of this login worked, but when I got redirect to Facebook callback url / redirect url after login to FB I got an exception which

DefaultApplication is not set

so i added FacebookSession::setDefaultApplication('appId', 'secret');

insuccessAction

I am still getting the error after logging in in the section below, I cannot get the session here.

try {
            $session = $helper->getSessionFromRedirect();

        } catch (FacebookRequestException $ex) {
            echo " When Facebook returns an error";
        } catch (\Exception $ex) {            
            echo " When validation fails or other local issues"; 
        }

      

        
        
        
      

    

I am getting error here catch (\Exception $ex) {
echo " When validation fails or other local issues"; }

$session = helper->getSessionFromRedirect();

what is causing the error here, my Facebook login credentials are correct.

I cannot figure out this error.