‘‘Decode uplink data message failure - Invalid output’’

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. (How to build your first TTN node: Arduino + RN2483)