I cant load a obj file and i followed the tutorial http://www.charglerode.com/blog/?p=164
I am using flashbuilder4 AS3 project.

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at away3d.loaders::Loader3D/loadTextures()[C:\HOME\08659543\flashBuilder_3D\away3d_3_6_0\src\ away3d\loaders\Loader3D.as:486]


public class mytest5 extends MovieClip
{
protected var _scene:Scene3D;
protected var _view:View3D;
protected var _camera:Camera3D;
protected var _lightirectionalLight3D;
protected var _loader:Loader3D;
protected var _mesh:Object3D;

public function mytest5()
{
initAway();
}

private function initAway():void
{
_camera = new Camera3D({zoom:20, focus:30, x:100, y:50, z:-500});

_scene = new Scene3D();

// _light = new DirectionalLight3D();
// _scene.addChild( _light );

_view = new View3D( { x:stage.stageWidth / 2, y:stage.stageHeight / 2, scene:_scene, camera:_camera, renderer:Renderer.CORRECT_Z_ORDER } );
addChild( _view );

_loader = Obj.load( "m4_sherman.obj", { scaling:10, bothsides:true } );
_loader.addOnSuccess( onObjLoad );
}

private function onObjLoad( e:Loader3DEvent ):void
{
_mesh = e.loader.handle;
_mesh.scaleX = -1;

_scene.addChild( _mesh );

addEventListener( Event.ENTER_FRAME, onRender );
}

private function onRender( e:Event ):void
{
_mesh.rotationY += 1;

_view.render();
}