Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Constraint" not found in /home/qcsvlel/www/core/modules/user/src/Plugin/Validation/Constraint/RoleExistsConstraint.php:18 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/user/src/Plugin/Validation/Constraint/RoleExistsConstraint.php on line 18