Fatal error: Uncaught Error: Interface "ApiPlatform\Core\GraphQl\Subscription\SubscriptionManagerInterface" not found in /home/dbdevweblamp/public_html/vendor/api-platform/core/src/GraphQl/Subscription/SubscriptionManager.php:32 Stack trace: #0 {main} thrown in /home/dbdevweblamp/public_html/vendor/api-platform/core/src/GraphQl/Subscription/SubscriptionManager.php on line 32