diff --git a/src/util.ts b/src/util.ts
index fe4045a9..407a3389 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -79,6 +79,7 @@ export class GBUtil {
         (config['spec'].servers = [{ url: `http://127.0.0.1:${GBConfigService.getServerPort()}/api/messages` }]);
       config['openapi'] = '3.0.0';
     }
+    return await new SwaggerClient(config);
   }
 
   public static toYAML(data) {