Fatal error: Uncaught Error: Interface "Psr\EventDispatcher\StoppableEventInterface" not found in /home/amper418/shopv2.amperio.ch/vendor/shopware/core/Framework/Extensions/Extension.php:14 Stack trace: #0 {main} thrown in /home/amper418/shopv2.amperio.ch/vendor/shopware/core/Framework/Extensions/Extension.php on line 14