(as3) Classes and methods

Okay... I'm trying to call methods from a class to no avail. It just tells me that I have undefined methods.

Why?

main.as:

Actionscript Code:

package 
{
    import flash.display.Sprite;
    import flash.events.Event;
    import _display.as;
    
    /**
     * ...
     * @author devon
     */
    public class Main extends Sprite 
    {
        
        public function Main():void 
        {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }
        
        private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            // entry point
            movie();
            txt();
        
        }
        
    }
    
}

_display.as

Actionscript Code:

package
{
    import flash.display.*;
    import flash.text.TextField;

    public class _display extends MovieClip
    {
        public var mc:MovieClip = new MovieClip();
        
        public function movie():void
        {
            mc.height = stage.stageHeight;
            mc.width = stage.stageWidth;
            mc.x = 0;
            mc.y = 0;
            stage.addChild(mc);
            trace("mc created");
        }
        
        public var myText:TextField = new TextField();
        
        public function txt():void
            {
                myText.text = "Yo.";
                mc.addChild(myText);
            }
    }
}

You did not instantiate the class file. If you want to call the movie function within the _display class, you have to let Flash know where and what it is.

actionscript Code:

package 
{
    import flash.display.Sprite;
    import flash.events.Event;
    import _display;
    
    /**
     * ...
     * @author devon
     */
    public class Main extends Sprite 
    {
        private var thisDisplay:_display = new _display();

        public function Main():void 
        {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }
        
        private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            // entry point
            thisDisplay.movie();
            thisDisplay.txt();
        
        }
        
    }
    
}

One other thing, there is a sort of a industry standard when it comes to naming your class file. They usually begin with a capital letter and not an underscore. This makes it easier for anyone else who many have to edit for material to understand that the class file is a custom class and not necessarily within the current document.

I see... Thanks a lot!!!!! But now I get this:

[Fault] exception, information=TypeError: Error #1009: Cannot access a property or method of a null object reference.

Any thoughts?

Can you be more specific as to where the error is pointing?