Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer" not found in /home/amper418/shopv2.amperio.ch/vendor/symfony/serializer/Normalizer/PropertyNormalizer.php:37 Stack trace: #0 {main} thrown in /home/amper418/shopv2.amperio.ch/vendor/symfony/serializer/Normalizer/PropertyNormalizer.php on line 37