Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer" not found in /home/yrdsb11w3creativ/public_html/yrdsb/vendor/symfony/serializer/Normalizer/ObjectNormalizer.php:27 Stack trace: #0 {main} thrown in /home/yrdsb11w3creativ/public_html/yrdsb/vendor/symfony/serializer/Normalizer/ObjectNormalizer.php on line 27