Hello everyone, I'm new here! I'm building my first quadcopter, and I'm almost done. However, when I arm the quad and push up the throttle, the motors do not move at all. The Afro ESC keeps beeping its beacon every few seconds, which, according to the manual means it it not receiving a signal. When I first apply power, all the props twitch slightly, so I'm pretty sure the wiring is correct. Am I forgetting something? Please help, I've been waiting weeks for this day! Here's a picture: http://imgur.com/NB9KrRI Thanks!