Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Constraint' not found in /home/almasai/www/people/_old_site/vendor/symfony/tests/Symfony/Tests/Component/Validator/Fixtures/ConstraintA.php:8 Stack trace: #0 /home/almasai/www/people/_old_site/vendor/symfony/tests/Symfony/Tests/Component/Validator/GraphWalkerTest.php(16): require_once() #1 {main} thrown in /home/almasai/www/people/_old_site/vendor/symfony/tests/Symfony/Tests/Component/Validator/Fixtures/ConstraintA.php on line 8