[away3d] Loading Collada Error

[giangfx]

I have an error when load a model .This is my output error

TypeError: Error #1009: Cannot access a property or method of a null
object reference.
        at away3d.loaders::Loader3D/loadTextures()
        at away3d.loaders::Loader3D/onGeometryComplete()
        at flash.events::EventDispatcher/dispatchEventFunction()
        at flash.events::EventDispatcher/dispatchEvent()
        at flash.net::URLLoader/onComplete()

This is my code

var loader:Loader3D = new Loader3D();
loader = Collada.load('20_cat_smooth_bake_channel.dae');

I attach my model ,a dae file http://www.mediafire.com/?fsem5jlqymmy1gs

Please ,help me .Thank all .