When I try to go through the servo calibration procedure after several prompted control inputs the system asks for yaw input. I only have roll and pitch servos installed. The servos are recognized during the configure process. I have rechecked the wiring and it is correct. I have the latest software (16.4) Apparently it must not be seeing movement in one of the servos. These are older servos purchased in 2015 that were used with a D100 but have "Sky View Ready" stickers on them and the proper wiring harness. Any suggestions how to trouble shoot ?