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Hey Gustavo,

The same thing happened to me, and I believe I figured out what causes it. If you run rqt_plot, create a new message, and then run a program that uses the new message without restarting rqt_plot, then rqt_plot will have no knowledge of the new message that you created.

From what I can tell, when you first run rqt_plot it checks what the available, valid messages are. That list only gets refreshed on startup. So to the fix is to simply restart rqt_plot.

Hope that helps!

Chief

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