Error in connection establishment between Dragino Gateway LG01-P and LoRa shield mounted on arduino uno

Hi All,
I am trying to send lora packets from client (Lora shield mounted on arduino uno) to server (Dragino Gateway LG01-P). I am using the basic examples (Lora simple client arduino) and (lora simple server yun) from Arduino desktop app. I am following instruction for this project from manual of LG01 from dragino website. when after all setup, running and uploading codes I got in client serial monitor that “no reply server. is lora server running?” and from server serial monitor I got “Connected”
Screenshot of serial monitor is given below:

what should I do ?