Ardupilot sim with sitl-miisionPlanner-matlab

hey,
i followed the tutorial - matlab simulation MATLAB Simulation — Dev documentation
i try to connect sitl-missionPlanner-matlab:
sim_vehicle.py --no-mavproxy -v ArduCopter -f JSON:
i got the error from missionPlanner : PreArm: Motors: check frame clase and type

i would appreciate some help with this error