Fatal error: Uncaught Error: Class "ApiPlatform\Metadata\GraphQl\Operation" not found in /var/www/crm_killing_ninja/vendor/api-platform/core/src/Metadata/GraphQl/Subscription.php:20 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/vendor/api-platform/core/src/Metadata/GraphQl/Subscription.php on line 20