Do_Set_Servo Command Execution Error

I have a problem with do_set_servo command in auto flight.
I got that error message above after do_set_servo WP passed.

I got two bay doors under the plane. I need to drop a tennis ball and then the door should be closed after the ball drops. The problem is that the doors open but doesn’t close.

My log files and mission plan are linked above. I will appreciate any help. Thank you.