Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Normalizer\NormalizerInterface" not found in /home/ldt/public_html/canvas/udoit/vendor/symfony/serializer/Normalizer/ProblemNormalizer.php:25 Stack trace: #0 {main} thrown in /home/ldt/public_html/canvas/udoit/vendor/symfony/serializer/Normalizer/ProblemNormalizer.php on line 25