Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /home/astechc1/public_html/vendor/sensio/framework-extra-bundle/src/EventListener/HttpCacheListener.php:27 Stack trace: #0 {main} thrown in /home/astechc1/public_html/vendor/sensio/framework-extra-bundle/src/EventListener/HttpCacheListener.php on line 27