NullreferenceExeption on this script.

I've been working on a game. Now I finished up this script today, along with a few more. Not to brag or anything, lol. But that's not relevant. Now I have this battery life thing, so it shows how much you've got left before you have to find more, And when I assign all the things and such. I get a nullreference exeption on the GUIText that shows the value. Here is the code. It's JavaScript by the way.

 public var script : flashlight;
 public var gui : GUIText;
 public var num;
 function Start() {
     script = GameObject.Find("flashlight").gameObject.GetComponentInChildren(flashlight);
     num = script.currentbatteryLife();
 }
 function Update(){
     gui.guiText = num.toString();
 }
 function OnGUI() {
     
 }