How to integrate Dragino Model gateway: LG02 com lora server

time=“2019-05-10T16:41:31Z” level=error msg=“finished client unary call” error=“rpc error: code = Unknown desc = lorawan/band: invalid data-rate” grpc.code=Unknown grpc.method=SendProprietaryPayload grpc.service=ns.NetworkServerService grpc.time_ms=1.759 span.kind=client system=grpc
may 10 11:41:31 srvlorawan lora-app-server[1505]: time=“2019-05-10T16:41:31Z” level=error msg=“send gateway ping error: send ping error: send proprietary payload error: rpc error: code = Unknown desc = lorawan/band: invalid data-rate”

Please use the search, I believe there are already topics covering this error:
https://forum.loraserver.io/search?q=invalid%20data-rate