[Mike Mahar]

I don't know why you are getting watchdog timer errors and can't tell without seeing your code. However, there are a few things about servos that you should be aware of. One, Make sure that there is a jumper on the digital sidecar associated with the PWM output that is driving your servo. That supplies power to the servo and it won't work without the jumper. The jumper goes right next to the PWM output. Two, the servo class takes a value between 0.0 and 1.0, not the -1.0 to 1.0 that you get from your joystick. You should add 1.0 to your joystick value and then divide by 2.