businesswoker 显示none是什么意思?

D:\web\gobang>php start_register.php start_web.php start_gateway.php start_businessworker.php start
----------------------- WORKERMAN -----------------------------
Workerman version:3.5.1          PHP version:7.1.10
------------------------ WORKERS -------------------------------
worker              listen                    processes status
Register            text://0.0.0.0:1236        1        
WebServer           http://0.0.0.0:55151       2        
ChatGateway         Websocket://0.0.0.0:7272   4        
ChatBusinessWorker  none                       4        
----------------------------------------------------------------
SendBufferToWorker fail. The connections between Gateway and BusinessWorker are not ready.