[away3d] [Away3D lite] Sprite3D and fixed length Vector issue

[Fiorenzo Morini]

Hi guys,
I'm trying to use Sprite3D, but as i try to add an instance of this
object to the scene via view.scene.addSprite, i receive the following
error:

RangeError: Error #1126: Cannot change the length of a fixed Vector.

My code is really simple:

var material:ColorMaterial = new ColorMaterial(0xff0000);
var sprite:Sprite3D = new Sprite(material);
sprite.x = sprite.y = sprite.z = 0;
view.scene.addSprite(sprite);

I've also tried with other materials, like BitmapMaterial, but always
with the same result.
Is there someone that has an idea on how to solve this issue?

Thank you!

Fiorenzo.