Couldn't register gateway GW_DUPLICATED_EUI

Hi,

I’m following instruction on (http://wiki.seeedstudio.com/LoRa_LoRaWan_Gateway_Kit/) where i want to connect to Loriot Server and register my gateway. Unfortunately, when I want to register my raspberry pi 3 gateway, “Couldn’t register gateway GW_DUPLICATED_EUI” appeared.



I hope someone can give me some insight to solve the problem.

Thank you