Motor not spinning issue

Dear sir/madam,
We are facing an issue that our flight controller is armed showing in mission planner software , but our motors are not spinning and also the disarmed error is automaticaly coming after some time.Can you guide us how to overcome this issue?

If you’re using MissionPlanner, you’re probably using ArduPilot and not PX4. I’d ask over in

Yes sir, we are using ardupilot, still this problem is occuring. Please give some guidance to resolve it.

Dear sir,
Can you please give guidance to resolve the above mentioned issue?

This is PX4 firmware, and Ardupilot is a different software.
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