Fail to add devices in step 4 Use Seeeduino LoRaWAN GPS(RHF76-052AM) access LoRaWAN server

Hi, i’m working on an IoT project that using seeedstudio lora lorawan gateways 915mhz for raspberry pi-3 and follow the steps to configure the board.

(http://wiki.seeedstudio.com/LoRa_LoRaWan_Gateway_Kit/).



I get stuck at step 4 Use Seeeduino LoRaWAN GPS(RHF76-052AM) access LoRaWAN server, section d where failed to display expected output in my serial monitor as compared to the tutorial. What I get is an error, “+MODE: ERROR(-1)”.



I hope someone can give me some insight on how to solve this error.

Thank you.