Keep getting error#1502 for this loop in as3 - actionscript-3

Question

It's supposed to be for a rhythm game, where while the mc is on the stage, the boolean keeps switching back and forth from true to flase and you have to catch it at the right time. But I keep getting an error...
while (theBeat)
{
if (theBeat.currentFrame < 5)
{
onBeat = true
trace(onBeat)
}
if (theBeat.currentFrame > 5)
{
onBeat = false
trace(onBeat)
}
}
Gives me:
1502 A script has executed for longer than 15 seconds.

Answer 1

while (theBeat) is an endless loop, because theBeat is never set to null from inside the loop. Endless loops freeze the Flash Player. Like DodgerThud and VC.One already mentioned in the comments you need to evaluate the condition over time, for example with ENTER_FRAME or a Timer, not in a single loop.
Example:
addEventListener(Event.ENTER_FRAME, enterFrame);
function enterFrame(e:Event):void {
if (theBeat) {
if (theBeat.currentFrame < 5) {
onBeat = true;
}
if (theBeat.currentFrame > 5) {
onBeat = false;
}
trace("onBeat:", onBeat);
}
}
And when things stop just remove the handler:
removeEventListener(Event.ENTER_FRAME, enterFrame);
You can use a Timer to evaluate once per second like this:
var timer:Timer = new Timer(1000);
timer.start();
timer.addEventListener(TimerEvent.TIMER, timerHandler);
function timerHandler(e:TimerEvent):void {
if (theBeat) {
if (theBeat.currentFrame < 5) {
onBeat = true;
}
if (theBeat.currentFrame > 5) {
onBeat = false;
}
trace("onBeat:", onBeat);
if (onBeat == true && spaceDown == true) {
points++;
trace("points:", points);
}
}
}
And to stop the timer:
timer.stop();