Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/content/21/13321421/html/var/www/hamster/projects/KingsSevens/web/index.php:2) in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Component/HttpFoundation/SessionStorage/NativeSessionStorage.php line 87

Stack Trace

1. in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Component/HttpKernel/Debug/ErrorHandler.php at line 65 
   62.         }
   64.         if (error_reporting() & $level && $this->level & $level) {
   65.             throw new \ErrorException(sprintf('%s: %s in %s line %d', isset($this->levels[$level]) ? $this->levels[$level] : $level, $message, $file, $line));
   66.         }
   68.         return false;
2. at ErrorHandler ->handle ('2', 'session_start(): Cannot send session cookie - headers already sent by (output started at /home/content/21/13321421/html/var/www/hamster/projects/KingsSevens/web/index.php:2)', '/home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Component/HttpFoundation/SessionStorage/NativeSessionStorage.php', '87', array())
   in at line  
3. at session_start ()
   in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Component/HttpFoundation/SessionStorage/NativeSessionStorage.php at line 87 
   84.             session_id($this->options['id']);
   85.         }
   87.         session_start();
   89.         self::$sessionStarted = true;
   90.     }
4. at NativeSessionStorage ->start ()
   in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Component/HttpFoundation/Session.php at line 62 
   59.             return;
   60.         }
   62.         $this->storage->start();
   64.         $attributes = $this->storage->read('_symfony2');
5. at Session ->start ()
   in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Bundle/FrameworkBundle/EventListener/SessionListener.php at line 56 
   53.         $request->setSession($session = $this->container->get('session'));
   55.         if ($this->autoStart || $request->hasPreviousSession()) {
   56.             $session->start();
   57.         }
   58.     }
   59. }
6. at SessionListener ->onKernelRequest (object(GetResponseEvent))
   in at line  
7. at call_user_func (array(object(SessionListener), 'onKernelRequest'), object(GetResponseEvent))
   in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Bundle/FrameworkBundle/Debug/TraceableEventDispatcher.php at line 82 
   80.             $this->called[$eventName.'.'.$info['pretty']] = $info;
   82.             call_user_func($listener, $event);
   84.             if ($event->isPropagationStopped()) {
   85.                 if (null !== $this->logger) {
8. at TraceableEventDispatcher ->doDispatch (array(array(object(RouterListener), 'onEarlyKernelRequest'), array(object(SessionListener), 'onKernelRequest'), array(object(Firewall), 'onKernelRequest'), array(object(RouterListener), 'onKernelRequest')), 'kernel.request', object(GetResponseEvent))
   in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php at line 59 
   56.             $event = new Event();
   57.         }
   59.         $this->doDispatch($this->getListeners($eventName), $eventName, $event);
   60.     }
   62.     /**
9. at EventDispatcher ->dispatch ('kernel.request', object(GetResponseEvent))
   in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Bundle/FrameworkBundle/ContainerAwareEventDispatcher.php at line 101 
   98.             }
   99.         }
   101.         parent::dispatch($eventName, $event);
   102.     }
   103. }
10. at ContainerAwareEventDispatcher ->dispatch ('kernel.request', object(GetResponseEvent))
    in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php at line 98 
    95.     {
    96.         // request
    97.         $event = new GetResponseEvent($this, $request, $type);
    98.         $this->dispatcher->dispatch(KernelEvents::REQUEST, $event);
    100.         if ($event->hasResponse()) {
    101.             return $this->filterResponse($event->getResponse(), $request, $type);
11. at HttpKernel ->handleRaw (object(Request), '1')
    in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php at line 71 
    68.     public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true)
    69.     {
    70.         try {
    71.             return $this->handleRaw($request, $type);
    72.         } catch (\Exception $e) {
    73.             if (false === $catch) {
    74.                 throw $e;
12. at HttpKernel ->handle (object(Request), '1', true)
    in /home/content/21/13321421/html/var/www/hamster/vendor/symfony/src/Symfony/Bundle/FrameworkBundle/HttpKernel.php at line 44 
    41.         $this->container->set('request', $request, 'request');
    43.         try {
    44.             $response = parent::handle($request, $type, $catch);
    45.         } catch (\Exception $e) {
    46.             $this->container->leaveScope('request');
13. at HttpKernel ->handle (object(Request), '1', true)
    in kernel.root_dir/bootstrap.php.cache at line 547 
    544.             $this->boot();
    545.         }
    547.         return $this->getHttpKernel()->handle($request, $type, $catch);
    548.     }
    550.     
14. at Kernel ->handle (object(Request))
    in /home/content/21/13321421/html/var/www/hamster/projects/KingsSevens/web/index.php at line 12 
    10. //$kernel = new AppCache(new AppKernel('prod', false));
    11. $kernel = new AppKernel('public_prod', true);
    12. $kernel->handle(Request::createFromGlobals())->send();