Failed to start the session because headers have already been sent.

500 Internal Server Error - RuntimeException

Stack Trace

in kernel.root_dir/cache/dev/classes.php at line 180
1. }
3. if (ini_get('session.use_cookies') && headers_sent()) {
4. throw new \RuntimeException('Failed to start the session because headers have already been sent.');
5. }
7. if (!session_start()) {
at NativeSessionStorage ->start ()
in kernel.root_dir/cache/dev/classes.php at line 277
1. if ($this->saveHandler->isActive() && !$this->started) {
2. $this->loadSession();
3. } elseif (!$this->started) {
4. $this->start();
5. }
7. return $this->bags[$name];
at NativeSessionStorage ->getBag ('attributes')
in kernel.root_dir/cache/dev/classes.php at line 724
2. public function remove($name)
3. {
4. return $this->storage->getBag($this->attributeName)->remove($name);
5. }
at Session ->remove ('_security_main')
in /vendor/symfony/symfony/src/Symfony/Component/Security/Http/Firewall/ContextListener.php at line 124
1. }
3. if ((null === $token = $this->context->getToken()) || ($token instanceof AnonymousToken)) {
4. $session->remove('_security_'.$this->contextKey);
5. } else {
6. $session->set('_security_'.$this->contextKey, serialize($token));
7. }
at ContextListener ->onKernelResponse (object(FilterResponseEvent))
at call_user_func (array(object(ContextListener), 'onKernelResponse'), object(FilterResponseEvent))
in /vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Debug/ContainerAwareTraceableEventDispatcher.php at line 139
2. $e2 = $this->stopwatch->start(isset($info['class']) ? substr($info['class'], strrpos($info['class'], '\\') + 1) : $info['type'], 'event_listener');
4. call_user_func($listener, $event);
6. $e2->stop();
at ContainerAwareTraceableEventDispatcher ->doDispatch (array(array(object(ContextListener), 'onKernelResponse'), array(object(ResponseListener), 'onKernelResponse'), array(object(FirePHPHandler), 'onKernelResponse'), array(object(CacheListener), 'onKernelResponse'), array(object(ResponseListener), 'onKernelResponse'), array(object(ProfilerListener), 'onKernelResponse'), array(object(WebDebugToolbarListener), 'onKernelResponse'), array(object(StreamedResponseListener), 'onKernelResponse')), 'kernel.response', object(FilterResponseEvent))
in kernel.root_dir/cache/dev/classes.php at line 4695
1. return $event;
2. }
4. $this->doDispatch($this->getListeners($eventName), $eventName, $event);
6. return $event;
7. }
at EventDispatcher ->dispatch ('kernel.response', object(FilterResponseEvent))
in kernel.root_dir/cache/dev/classes.php at line 4913
1. {
2. $this->lazyLoad($eventName);
4. return parent::dispatch($eventName, $event);
5. }
7. public function getContainer()
at ContainerAwareEventDispatcher ->dispatch ('kernel.response', object(FilterResponseEvent))
in /vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Debug/ContainerAwareTraceableEventDispatcher.php at line 78
2. $e1 = $this->stopwatch->start($eventName, 'section');
4. parent::dispatch($eventName, $event);
6. $e1->stop();
at ContainerAwareTraceableEventDispatcher ->dispatch ('kernel.response', object(FilterResponseEvent))
in kernel.root_dir/bootstrap.php.cache at line 1447
1. {
2. $event = new FilterResponseEvent($this, $request, $type, $response);
4. $this->dispatcher->dispatch(KernelEvents::RESPONSE, $event);
6. return $event->getResponse();
7. }
at HttpKernel ->filterResponse (object(Response), object(Request), '1')
in kernel.root_dir/bootstrap.php.cache at line 1439
1. }
2. }
4. return $this->filterResponse($response, $request, $type);
5. }
at HttpKernel ->handleRaw (object(Request), '1')
in kernel.root_dir/bootstrap.php.cache at line 1383
1. public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true)
2. {
3. try {
4. return $this->handleRaw($request, $type);
5. } catch (\Exception $e) {
6. if (false === $catch) {
7. throw $e;
at HttpKernel ->handle (object(Request), '1', true)
in kernel.root_dir/bootstrap.php.cache at line 1559
1. $this->container->set('request', $request, 'request');
3. try {
4. $response = parent::handle($request, $type, $catch);
5. } catch (\Exception $e) {
6. $this->container->leaveScope('request');
at HttpKernel ->handle (object(Request), '1', true)
in kernel.root_dir/bootstrap.php.cache at line 610
1. $this->boot();
2. }
4. return $this->getHttpKernel()->handle($request, $type, $catch);
5. }
at Kernel ->handle (object(Request))
in /web/app_dev.php at line 38
1. $kernel = new AppKernel('dev', true);
2. $kernel->loadClassCache();
3. $request = Request::createFromGlobals();
4. $response = $kernel->handle($request);
5. $response->send();
6. $kernel->terminate($request, $response);

Logs

1 error

DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Bundle\FrameworkBundle\EventListener\SessionListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\RouterListener::onKernelRequest".
INFO - Matched route "strony_show_front" (parameters: "_controller": "Vaka\FrontendBundle\Controller\PageFrontController::showAction", "slug": "koncert-sinfonia-varsovia", "_route": "strony_show_front")
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\LocaleListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\Security\Http\Firewall::onKernelRequest".
INFO - Populated SecurityContext with an anonymous Token
DEBUG - Notified event "kernel.request" to listener "Symfony\Bundle\AsseticBundle\EventListener\RequestListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Stof\DoctrineExtensionsBundle\EventListener\LocaleListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Stof\DoctrineExtensionsBundle\EventListener\LoggerListener::onKernelRequest".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Bundle\FrameworkBundle\DataCollector\RouterDataCollector::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ControllerListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ParamConverterListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Acme\DemoBundle\EventListener\ControllerListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Component\HttpKernel\DataCollector\RequestDataCollector::onKernelController".
DEBUG - SELECT t0.id AS id1, t0.name AS name2, t0.title AS title3, t0.slug AS slug4, t0.content AS content5, t0.seo_title AS seo_title6, t0.seo_description AS seo_description7, t0.enable AS enable8, t0.seo_keywords AS seo_keywords9, t0.created_at AS created_at10, t0.site AS site11, t0.lft AS lft12, t0.lvl AS lvl13, t0.rgt AS rgt14, t0.root AS root15, t0.parent_id AS parent_id16, t0.gallery_id AS gallery_id17 FROM pages t0 WHERE t0.slug = ? LIMIT 1
DEBUG - Notified event "kernel.view" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener::onKernelView".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Bundle\FrameworkBundle\EventListener\SessionListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\RouterListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\LocaleListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\Security\Http\Firewall::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Bundle\AsseticBundle\EventListener\RequestListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Stof\DoctrineExtensionsBundle\EventListener\LocaleListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Stof\DoctrineExtensionsBundle\EventListener\LoggerListener::onKernelRequest".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Bundle\FrameworkBundle\DataCollector\RouterDataCollector::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ControllerListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ParamConverterListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Acme\DemoBundle\EventListener\ControllerListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Component\HttpKernel\DataCollector\RequestDataCollector::onKernelController".
DEBUG - SELECT t0.id AS id1, t0.name AS name2, t0.title AS title3, t0.slug AS slug4, t0.content AS content5, t0.seo_title AS seo_title6, t0.seo_description AS seo_description7, t0.enable AS enable8, t0.seo_keywords AS seo_keywords9, t0.created_at AS created_at10, t0.site AS site11, t0.lft AS lft12, t0.lvl AS lvl13, t0.rgt AS rgt14, t0.root AS root15, t0.parent_id AS parent_id16, t0.gallery_id AS gallery_id17 FROM pages t0 WHERE t0.site = ? ORDER BY t0.id ASC
DEBUG - Notified event "kernel.view" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener::onKernelView".
DEBUG - Listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener::onKernelView" stopped propagation of the event "kernel.view".
DEBUG - Notified event "kernel.response" to listener "Symfony\Component\Security\Http\Firewall\ContextListener::onKernelResponse".
DEBUG - Notified event "kernel.response" to listener "Symfony\Component\Security\Http\RememberMe\ResponseListener::onKernelResponse".
DEBUG - Notified event "kernel.response" to listener "Symfony\Bridge\Monolog\Handler\FirePHPHandler::onKernelResponse".
DEBUG - Notified event "kernel.response" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\CacheListener::onKernelResponse".
DEBUG - Notified event "kernel.response" to listener "Symfony\Component\HttpKernel\EventListener\ResponseListener::onKernelResponse".
DEBUG - Notified event "kernel.response" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelResponse".
DEBUG - Notified event "kernel.response" to listener "Symfony\Bundle\WebProfilerBundle\EventListener\WebDebugToolbarListener::onKernelResponse".
DEBUG - Notified event "kernel.response" to listener "Symfony\Component\HttpKernel\EventListener\StreamedResponseListener::onKernelResponse".
DEBUG - Listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener::onKernelView" stopped propagation of the event "kernel.view".
DEBUG - Notified event "kernel.response" to listener "Symfony\Component\Security\Http\Firewall\ContextListener::onKernelResponse".
DEBUG - Write SecurityContext in the session
DEBUG - Notified event "kernel.exception" to listener "Symfony\Component\Security\Http\Firewall\ExceptionListener::onKernelException".
DEBUG - Notified event "kernel.exception" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelException".
DEBUG - Notified event "kernel.exception" to listener "Symfony\Component\HttpKernel\EventListener\ExceptionListener::onKernelException".
CRITICAL - RuntimeException: Failed to start the session because headers have already been sent. (uncaught exception) at /app/cache/dev/classes.php line 180
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Bundle\FrameworkBundle\EventListener\SessionListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\RouterListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\LocaleListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\Security\Http\Firewall::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Bundle\AsseticBundle\EventListener\RequestListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Stof\DoctrineExtensionsBundle\EventListener\LocaleListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Stof\DoctrineExtensionsBundle\EventListener\LoggerListener::onKernelRequest".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Bundle\FrameworkBundle\DataCollector\RouterDataCollector::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ControllerListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ParamConverterListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Acme\DemoBundle\EventListener\ControllerListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Component\HttpKernel\DataCollector\RequestDataCollector::onKernelController".