Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Normalizer\NormalizerInterface" not found in /home/elcrestweb/public_html/concrete/vendor/symfony/serializer/Normalizer/BackedEnumNormalizer.php:23 Stack trace: #0 {main} thrown in /home/elcrestweb/public_html/concrete/vendor/symfony/serializer/Normalizer/BackedEnumNormalizer.php on line 23