Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Constraint' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/formatter-bundle/Validator/Constraints/Formatter.php:19 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/formatter-bundle/Validator/Constraints/Formatter.php on line 19