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Thank you for your interest in the Intel Aero Compute Board.
I have done some research and as far as we know, the message is not available in Ardupilot, in the optical flow instructions it states that PX4 needs to be build and installed.
I would like to suggest you try it with PX4. You can find information on the following link .
"build and install the latest stable PX4"
Let me know if this is helpful,