This message means the camera can’t perform the automatic calibration because the scene is not suitable. It’s ideally expecting good illumination and unobstructed view with textured elements. This is just a step the SDK performs at every run in the background to make sure the calibration is still correct.
This can be safely ignored; this will run next time. The previous calibration values will be taken.
However, this may indicate bad conditions, like very low light or strong occlusion