Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventSubscriberInterface' not found in /home/devmecseminars/public_html/mec/vendor/symfony/psr-http-message-bridge/EventListener/PsrResponseListener.php:18 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/psr-http-message-bridge/EventListener/PsrResponseListener.php on line 18