i cant call other swf file

[thathany]

Hello guys, i'm a beginner
I've been away for a while and I just started to work on my new ordinary game (in flash). I want to import other swf file but it doesnt works and display an error :

TypeError: Error #1009: Cannot access a property or method of a null object reference.
	at stage1_fla::MainTimeline/mulai()[stage1_fla.MainTimeline::frame1:52]
	at stage1_fla::MainTimeline/writeText()[stage1_fla.MainTimeline::frame1:40]

And here is my code :

var myText:String; 
var counter:int = 0; 
var MC:Sprite;
var ldr:Loader;

MC:new Sprite;
ldr: new Loader;
fscommand("fullscreen", "true");

var format : TextFormat = new TextFormat();
format.size = 20;
format.font = "Lipsum";
//format.bold = true;
format.color = 0x000000; 

var textField : TextField = new TextField();
textField.width = 800;
textField.height = 550;
textField.selectable = false;
textField.wordWrap = true;
textField.defaultTextFormat = format;
textField.x = 300; textField.y = 160;
addChild(textField);
				


var textLoader:URLLoader = new URLLoader(new URLRequest("story1.txt"));
textLoader.addEventListener(Event.COMPLETE, function(e:Event){initText(e.target.data);});

function initText(string:String):void{
	myText = string; 
	addEventListener(Event.ENTER_FRAME, writeText); 
}

function writeText(e:Event):void{
	if (counter <= myText.length){
   	     textField.text = myText.substr(0,counter); 
   	     counter++; 
		 if(counter == myText.length){
			mulai();
		}
	}
	
	else{
		removeEventListener(Event.ENTER_FRAME,writeText); 
	}

}

function mulai():void{
	
   ldr.load(new URLRequest("Soal_1.swf"));
   ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, loadComplete);
}
function loadComplete(e:Event):void 
{
	ldr.contentLoaderInfo.removeEventListener(Event.COMPLETE, loadComplete);//biasakan untuk event yang sudah tidak dipake lagi di remove
	MC.addChild(ldr.content);
	addChild(MC);
}
function destroy():void
{
	MC.removeChild(ldr.content);
	ldr.unloadAndStop();
}

I just used the debug mode in flash and it said that it contains error in ldr.load(new URLRequest("Soal_1.swf"));

Can somebody help me out ?

[Poony]

Here is your problem

ldr: new Loader;

Should be

ldr = new Loader();

[thathany]

thanks for reply my thread Poony
and I've tried your suggestion .

And it works thanks a lot