Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Call to a member function start() on null in /var/www/html/teamdeals/src/Deals/Bundle/MainBundle/Listener/ConfigListener.php:19 Stack trace: #0 /var/www/html/teamdeals/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php(212): Deals\Bundle\MainBundle\Listener\ConfigListener->onKernelRequest(Object(Symfony\Component\HttpKernel\Event\GetResponseEvent), 'kernel.request', Object(Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher)) #1 /var/www/html/teamdeals/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php(44): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(Array, 'kernel.request', Object(Symfony\Component\HttpKernel\Event\GetResponseEvent)) #2 /var/www/html/teamdeals/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php(127): Symfony\Component\EventDispatcher\EventDispatcher->dispatch('kernel.request', Object(Symfony\Component\HttpKernel\Event\Get in /var/www/html/teamdeals/src/Deals/Bundle/MainBundle/Listener/ConfigListener.php on line 19