Fatal error: Uncaught Error: Interface 'Symfony\Component\Serializer\Mapping\Loader\LoaderInterface' not found in /home/thomaeo/www/vendor/symfony/serializer/Mapping/Loader/AnnotationLoader.php:33 Stack trace: #0 {main} thrown in /home/thomaeo/www/vendor/symfony/serializer/Mapping/Loader/AnnotationLoader.php on line 33