Fatal error: Uncaught Error: Class "Symfony\Component\Form\AbstractExtension" not found in /var/www/crm_killing_ninja/vendor/symfony/form/Extension/Validator/ValidatorExtension.php:28 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/vendor/symfony/form/Extension/Validator/ValidatorExtension.php on line 28