Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Mapping\Loader\LoaderInterface" not found in /home/yrdsb11w3creativ/public_html/109/vendor/symfony/serializer/Mapping/Loader/AttributeLoader.php:35 Stack trace: #0 {main} thrown in /home/yrdsb11w3creativ/public_html/109/vendor/symfony/serializer/Mapping/Loader/AttributeLoader.php on line 35