Pixhawk ardupilot flight stack


I uploaded ardupilot flight stack on Pixhawk and when I open OGroundControl, it gives me error. I’ve tried pressing the reset button near the Usb plug on Pixhawk, it does not help.

Then, i thought the problem may be my OS. So i connected my Pixhawk by both usb and telemetry kit to Mission Planner in Windows. It does not help either.

By the way, when i uploaded the ardupilot flight stack to APM, it works well and px4 flight stack in Pixhawk works well,too.

Is there something wrong i did? or is there ant solution to fix that?