Fatal error: Uncaught Error: Interface "JMS\Serializer\Handler\SubscribingHandlerInterface" not found in /home/gingerbrup/rappelapi/vendor/friendsofsymfony/rest-bundle/Serializer/Normalizer/FormErrorHandler.php:25 Stack trace: #0 {main} thrown in /home/gingerbrup/rappelapi/vendor/friendsofsymfony/rest-bundle/Serializer/Normalizer/FormErrorHandler.php on line 25