Fatal error: Uncaught Error: Class 'Symfony\Component\Serializer\Normalizer\AbstractNormalizer' not found in /home/gmcguire/public_html/concrete5/concrete/vendor/symfony/serializer/Normalizer/AbstractObjectNormalizer.php:37 Stack trace: #0 {main} thrown in /home/gmcguire/public_html/concrete5/concrete/vendor/symfony/serializer/Normalizer/AbstractObjectNormalizer.php on line 37