Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /var/www/apache/dev/cal/web/vendor/symfony/security/Http/Firewall.php:31 Stack trace: #0 {main} thrown in /var/www/apache/dev/cal/web/vendor/symfony/security/Http/Firewall.php on line 31