Fatal error: Uncaught Error: Interface "Symfony\Component\Workflow\Validator\DefinitionValidatorInterface" not found in /home/www/aes-demo/api-8.0.0#316/vendor/symfony/workflow/Validator/WorkflowValidator.php:21 Stack trace: #0 {main} thrown in /home/www/aes-demo/api-8.0.0#316/vendor/symfony/workflow/Validator/WorkflowValidator.php on line 21