Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Mapping\Loader\FileLoader" not found in /home/wizilen/www/vendor/symfony/serializer/Mapping/Loader/XmlFileLoader.php:27 Stack trace: #0 {main} thrown in /home/wizilen/www/vendor/symfony/serializer/Mapping/Loader/XmlFileLoader.php on line 27