Problem displaying an image with AS3

[MVGS]

Hi. I'm trying to display a single image using pure AS3 code in flashDevelop. My code is this simple thing:

package 
{
	import flash.display.*;
	
	public class Main extends Sprite
	{		
		[Embed(source = "../assets/logoAGDG.png", mimeType = "image/png")]
		private var logoAGDG:Class;

		public function Main() 
		{
			super();
			trace("loading image");
			var sp  = new logoAGDG();
			addChild(sp);
		}
        }
}

It displays the image using Flash Player. However, it isn't shown in GFx Player or in game.
In the GFX Player this error is thrown in bold red letters:

Error: TypeError: Error #1009: Cannot access a property or method of a null object reference.
at Bitmap Asset instance constructor()[E:\dev\4.y\frameworks\project\framework\src;mx\core;BitmapAsset.as:136]
at Main_logoAGDG instance constructor()
at Main instance constructor()

So, what would be the best way to show embedded images? TIA

[Gedden]

for starters I would make sure your image is valid.
- It must be in the proper directory or it wont show up, (UDKGame\Flash\GameUI\GameUI\logoAGDG.png) even in the scale-form editor.
- base2 dimensions (64x32, 512x512 etc)
- make sure you have removed the ".png" from the suffix of the symbol.