Fatal error: Uncaught Error: Class 'Symfony\Component\Security\Acl\Permission\MaskBuilder' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/admin-bundle/Security/Acl/Permission/MaskBuilder.php:20 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/admin-bundle/Security/Acl/Permission/MaskBuilder.php on line 20