I was getting this error multiple times while trying to surface the spoil board. Although the coordinates of the surface to mill were inside the machine boundaries, the half-circle that was automatically generated by Fusion 360 to go from one row to the next was going outside of the machine boundaries. I fixed it by reducing my milling area until the tool path no longer exceeded the machine boundaries.
Hi. The router mount does not clear the nuts protruding from the Y-plate inner. It might be better to put the screws the other way around.