Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Normalizer\NormalizableInterface" not found in /home/yrdsb11w3creativ/public_html/yrdsb/vendor/symfony/serializer/Tests/Fixtures/ScalarDummy.php:19 Stack trace: #0 {main} thrown in /home/yrdsb11w3creativ/public_html/yrdsb/vendor/symfony/serializer/Tests/Fixtures/ScalarDummy.php on line 19