ERROR: Decode uplink data message failure - Invalid output

End Devices (Nodes)
1

Hello. I’m new here so I have many questions :slight_smile: . I’m sending an uplink message (a string like hello) to the gateway using Arduino + rn2483. The messages I sent appear on the ardunio serial port screen and also on the TTN live data screen. However, I am getting an error like this:
‘‘Decode uplink data message failure - Invalid output’’. What should I do, thank you in advance for your help.

note: I made all my adjustments and codes from here. (https://www.thethingsnetwork.org/forum/t/how-to-build-your-first-ttn-node-arduino-rn2483/1574)