Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in C:\xampp\htdocs\electronica\vendor\sensio\framework-extra-bundle\EventListener\TemplateListener.php:30 Stack trace: #0 {main} thrown in C:\xampp\htdocs\electronica\vendor\sensio\framework-extra-bundle\EventListener\TemplateListener.php on line 30