Loraserver & lora-app-server rpc error

Hi,

I am new with lorasever, I follow the “quick install” instruction from loaserver.io but I end with this two errors:

loraserver
août 28 15:13:42 raspberrypi loraserver[21648]: time=“2018-08-28T15:13:42+02:00” level=error msg=“finished unary call with code Unknown” error=“rpc error: code = Unknown desc = lorawan/band: invalid data-rate” grpc.code=Unknown grpc.method=SendProprietaryPayload grpc.service=ns.NetworkServerService grpc.start_time=“2018-08-28T15:13:42+02:00” grpc.time_ms=0.221 peer.address=“127.0.0.1:43004” span.kind=server system=grpc

lora-app-server
août 28 15:30:43 raspberrypi lora-app-server[22359]: time=“2018-08-28T15:30:43+02:00” 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=2.985 span.kind=client system=grpc

Please, if someone can help me to solve it.
thanks