[Cause]
A camera different from the one used for teaching is connected, or a color camera is specified for a 3D wide-area sensor.
[Countermeasure]
Check whether a camera different from the one used for teaching is connected, or a color camera is specified for a 3D wide-area sensor. As a precaution, check whether the multiplexer configuration is the same as when teaching, whether multiplexer power is on, and whether the CCU is connected correctly.