Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\ConstraintValidator' not found in /home/soh-works/www/Stepup_test/vendor/symfony/validator/Constraints/CollectionValidator.php:22 Stack trace: #0 {main} thrown in /home/soh-works/www/Stepup_test/vendor/symfony/validator/Constraints/CollectionValidator.php on line 22