Fatal error: Uncaught Error: Interface 'Symfony\Component\Form\DataTransformerInterface' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/user-bundle/Form/Transformer/RestoreRolesTransformer.php:18 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/user-bundle/Form/Transformer/RestoreRolesTransformer.php on line 18