TypeError: Error #1034 Type Coercion failed: cannot convert to Class

From the book “AdvancED Actionscript 3.0 Animation”

I fixed a problem in the code they give you that is using [Embed…] instead of using library objects with linkage names.

I still have the error:
TypeError: Error #1034: Type Coercion failed: cannot convert Tile_01@1bf93a61 to Class.
at GraphicTest$iinit()

With the following code…

    public class GraphicTest extends Sprite
    {
        private var world:IsoWorld;
        
        //[Embed(source="tile_01.png")]
        //private var Tile01:Class;
        private var Tile01 = new Tile_01();
       
        public function GraphicTest()
        {
            world = new IsoWorld();
            world.x = stage.stageWidth / 2;
            world.y = 100;
            addChild(world);
            
            for(var i:int = 0; i < 20; i++)
            {
                for(var j:int = 0; j < 20; j++)
                {
                    var tile:GraphicTile = new GraphicTile(20, Tile01, 20, 10);
                    tile.position = new Point3D(i * 20, 0, j * 20);
                    world.addChildToFloor(tile);
                }
            }
        }

The GraphicTile Class is the following code…


package com.friendsofed.isometric
{
    import flash.display.DisplayObject;
    
    public class GraphicTile extends IsoObject
    {
        public function GraphicTile(size:Number, classRef:Class, xoffset:Number, yoffset:Number):void
        {
            super(size);
            
            var gfx:DisplayObject = new classRef() as DisplayObject;
            gfx.x = -xoffset;
            gfx.y = -yoffset;
            addChild(gfx);
        }
    }
}