Error #1009- Only when there is code present in main class - actionscript-3

Question

Please do forgive me if this is a stupid question, by I really need to know the solution. So here I have a program that generates particles every set distance of space. My program consists of a document class, called supportForce and an object class(of the particle) called TheDot.
In the TheDot object class, I have the following code-
package
{
import flash.display.MovieClip;
import flash.events.Event;
public class TheDot extends MovieClip
{
var base:Object = MovieClip(root);
public function TheDot()
{
this.addEventListener(Event.ENTER_FRAME, eFrame);
}
private function eFrame(event:Event):void
{
if (base.currentFrame == 1){
trace ("G");
}
}
}
}
This code works perfectly (outputs G) until I add the following code into the document class, suportForce, under an ENTER_FRAME event-
var ctX:int = 0,ctY:int = 0,done:Boolean = false;
while (done == false)
{
var dots:TheDot = new TheDot ;
dots.alpha = 0;
dots.x += (25 * ctX);
dots.y += (25 * ctY);
ctX++;
if (ctX == 22 && ctY == 20)
{
done = true;
break;
}
else if (ctX == 22)
{
ctX = 0;
ctY++;
}
stage.addChild(dots);
}
So now, there is an Error #1009: Cannot access a property or method of a null object reference at TheDot/eFrame(). I have declared all the variables in the correct place, and also the functions. Thanks in advance. I have the link to the .fla and .as files in my drive here, do use it if necessary.
https://drive.google.com/folderview?id=0B8QnUfRAn9lKLUVqRjNSRHNpRkU&usp=sharing

Answer 1

FIRST
var dots:TheDot = new TheDot(stage);
public class TheDot extends MovieClip
{
var base:Object;
public function TheDot(stageRef:Stage)
{
base = stageRef;
this.addEventListener(Event.ADDED_TO_STAGE, init);
}
public function init(e:Event) {
this.removeEventListener(Event.ADDED_TO_STAGE, init);
this.addEventListener(Event.ENTER_FRAME, eFrame);
}
private function eFrame(event:Event):void
{
if (base.currentFrame == 1){
trace ("G");
}
}
Try this!