Fatal error: Uncaught Error: Interface 'JMS\Serializer\Handler\SubscribingHandlerInterface' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/core-bundle/Serializer/SerializerHandlerInterface.php:19 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/core-bundle/Serializer/SerializerHandlerInterface.php on line 19