Send gateway ping error: send ping error: send proprietary payload error: rpc error: code = Unknown desc = lorawan/band: invalid data-rate

Hallo, This is my first installation of ChirpStack

My Installation based on Docker image brings the following Error in the Console.

chirpstack-network-server_1 | time=“2022-02-02T06:16:32.611411859Z” level=error msg=“finished unary call with code Unknown” ctx_id=d6745997-d441-4bb7-9980-1470e52cb273 error=“rpc error: code = Unknown desc = lorawan/band: invalid data-rate” grpc.code=Unknown grpc.method=SendProprietaryPayload grpc.service=ns.NetworkServerService grpc.start_time=“2022-02-02T06:16:32Z” grpc.time_ms=0.083 peer.address=“172.19.0.7:56278” span.kind=server system=grpc
chirpstack-application-server_1 | time=“2022-02-02T06:16:32.611633575Z” level=error msg=“finished client unary call” ctx_id="" error=“rpc error: code = Unknown desc = lorawan/band: invalid data-rate” grpc.code=Unknown grpc.ctx_id=d6745997-d441-4bb7-9980-1470e52cb273 grpc.duration=“656.277µs” grpc.method=SendProprietaryPayload grpc.service=ns.NetworkServerService span.kind=client system=grpc
chirpstack-application-server_1 | time=“2022-02-02T06:16:32.611986245Z” level=error msg=“send gateway ping error: send ping error: send proprietary payload error: rpc error: code = Unknown desc = lorawan/band: invalid data-rate”

Any Idea where I have to correct the Data-rage parameter

Many Thanks

Roman