Hi @Praveen_Kumar_R,
I think that your error is related to a worng or incomplete configuration of the device on the LoRa App Server webui.
Unfortunately, I don’t know exactly the meaning of the error, but I think that @brocaar can surely help you understanding it.
I’m sorry for not being helpful, but I feel you are very close to the solution !
I put here my downlink packet log from Live LoRaWAN frame logs:
