Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/amper418/shopv2.amperio.ch/vendor/shopware/core/Checkout/Gateway/Command/Event/CheckoutGatewayCommandsCollectedEvent.php:20 Stack trace: #0 {main} thrown in /home/amper418/shopv2.amperio.ch/vendor/shopware/core/Checkout/Gateway/Command/Event/CheckoutGatewayCommandsCollectedEvent.php on line 20