Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Mapping\Loader\FileLoader" not found in /home/aipnbsfo/public_html/vendor/symfony/serializer/Mapping/Loader/YamlFileLoader.php:28 Stack trace: #0 {main} thrown in /home/aipnbsfo/public_html/vendor/symfony/serializer/Mapping/Loader/YamlFileLoader.php on line 28