Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Constraint" not found in /var/www/html/demo.ininli.ca/releases/16/vendor/symfony/validator/Constraints/Issn.php:24 Stack trace: #0 {main} thrown in /var/www/html/demo.ininli.ca/releases/16/vendor/symfony/validator/Constraints/Issn.php on line 24