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I've gotten this issue several times despite the fact that I am using the correct version. I found that this usually due to a connection issue and ROS not being able to connect with the Arduino. Usually the solution is to disconnect the Arduino or to restart my computer. This usually solves the problem.

I've gotten this issue several times despite the fact that I am using the correct version. I found that this usually due to a connection issue and ROS not being able to connect with the Arduino. Usually the solution is to disconnect and reconnect the Arduino or to restart my computer. This usually solves the problem.