Fatal error: Uncaught Error: Interface 'Symfony\Component\Serializer\Normalizer\NormalizerInterface' not found in /home/soh-works/www/3good_old/vendor/symfony/serializer/Normalizer/DateTimeNormalizer.php:23 Stack trace: #0 {main} thrown in /home/soh-works/www/3good_old/vendor/symfony/serializer/Normalizer/DateTimeNormalizer.php on line 23