RFD's Communication Issue


I configured the 2 RFD’s for peer-to-peer connection using RFD GUI.
Baud Rate :57600
Air Speed :64
Net ID :3

when i tried to send mavlink messages using the RFD’s both are pairing and Green light in solid state and red light is blinking. But the messages are not transmitting. When i tried to connect and check the RFD’s in Mission planner i’m getting error. Here is the picture of the error. How to solve this error??