Fatal error: Uncaught Error: Class 'FOS\UserBundle\Form\Handler\RegistrationFormHandler' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/user-bundle/Form/Handler/RegistrationFormHandler.php:28 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/user-bundle/Form/Handler/RegistrationFormHandler.php on line 28