Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Constraint' not found in /home/almasai/www/people/_old_site/vendor/bundles/FOS/UserBundle/Validator/Unique.php:19 Stack trace: #0 {main} thrown in /home/almasai/www/people/_old_site/vendor/bundles/FOS/UserBundle/Validator/Unique.php on line 19