Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Constraint' not found in /home/benjamincb/demos/acdg-site/vendor/symfony/security-core/Validator/Constraints/UserPassword.php:21 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/symfony/security-core/Validator/Constraints/UserPassword.php on line 21