Pixhawk not arming with GCS

Hardware Pixhawk family
1

I’m making the switch over from APM2.X to Pixhawk. I have set everything up, gone through the params and everything looks good, but when I hit Arm/Disarm in the GCS I get a error message: “Error: command rejected by MAV”. Can anyone tell me what I have missed or not done?
Pixhawk: 3.0.1, Mission Planner1.3.41, Rover firmware. I have GPS:3D dgps, EKF Vibe, no HUD error messages.

Any help much appreciated.
Cheers,
RS

2

Look at the messages tab in MP (you may have to scroll right from the actions tab to find it). You should see a message starting with PreArm that indicates why the vehicle rejected arming.

3

Thank you kind sir, I should get to in with in the hour.

Cheers,
RS

4

Wicked Shell, thanks, you taught me a new tool. Very handy. Problem solved.

Cheers,
RS

5

can you tell me what was the problem … i am facing same issue
urgent please …