Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /home/amper418/shopv2.amperio.ch/vendor/shopware/storefront/Event/CartMergedSubscriber.php:15 Stack trace: #0 {main} thrown in /home/amper418/shopv2.amperio.ch/vendor/shopware/storefront/Event/CartMergedSubscriber.php on line 15