Fatal error: Uncaught Error: Class "GraphQL\Executor\Promise\Adapter\SyncPromise" not found in /home/telefonai/public_html/test.telefonai.eu/vendor/webonyx/graphql-php/src/Deferred.php:9 Stack trace: #0 {main} thrown in /home/telefonai/public_html/test.telefonai.eu/vendor/webonyx/graphql-php/src/Deferred.php on line 9