Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\SerializerInterface" not found in /home/amper418/shopv2.amperio.ch/vendor/symfony/serializer/Serializer.php:46 Stack trace: #0 {main} thrown in /home/amper418/shopv2.amperio.ch/vendor/symfony/serializer/Serializer.php on line 46