Fatal error: Uncaught Error: Interface 'Symfony\Component\Serializer\Normalizer\NormalizableInterface' not found in /home/gmcguire/public_html/concrete5/concrete/src/Attribute/Command/RebuildIndexCommandInterface.php:9 Stack trace: #0 {main} thrown in /home/gmcguire/public_html/concrete5/concrete/src/Attribute/Command/RebuildIndexCommandInterface.php on line 9