Fatal error: Uncaught Error: Interface 'Sonata\CoreBundle\Serializer\SerializerHandlerInterface' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/core-bundle/Serializer/BaseSerializerHandler.php:22 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/core-bundle/Serializer/BaseSerializerHandler.php on line 22