Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Normalizer\DenormalizableInterface" not found in /home/rogertabor/public_html/updates/concrete-cms-9.1.1/concrete/src/Board/Instance/Slot/Content/ObjectCollection.php:9 Stack trace: #0 {main} thrown in /home/rogertabor/public_html/updates/concrete-cms-9.1.1/concrete/src/Board/Instance/Slot/Content/ObjectCollection.php on line 9