There a few things missing:
- Enable Gimbal module: go to Camstab tab, enable and power cycle.
- Define outputs, go to the vehicle tab and define each motor outputs or output module show a error (Red)
- Put some receiver channels as input or the INPUT module show a red alarm.
File attached is a working config from yours, should need to load a first time, reboot and load again.
The Gimbal works all time, no need to be armed.