No valid local position estimation error in xplane and px4 connection

i want to run the custom xplane model of mine with px4 autopilot. Also i made a basic or simple vtol launch pad from blender and added in xplane simulator world… But the problem is, i am getting “No valid local position estimate” error in QGC… But i am did not get the same error in px4 without using the vtol launch pad… what do i need to do in my end…