(keitai-l) C3DCanvas problem (on emulator)

Hi
I'm trying to use the C3DCanvas class, contained in the optional 
packages for DoJa3.5. The emulator I'm using (iAppli tool for 
DoJa-3.5(FOMA)) gives a runtime exception when the class is 
instantiated. According to the docs this error does occur if you try to 
create more than one instance of C3DCanvas, but I'm not doing that (full 
code below). Has anyone got this working successfully on this emulator? 
For reference, I am basing my app on the code example found at 
http://www.mitsubishielectric.co.jp/service/d-style/d_spec/504i_java/z3d/z3dg_121.html 


ChrisC

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package test;
import com.nttdocomo.ui.*;
import com.nttdocomo.opt.ui.j3d2.*;

public class Test extends IApplication
{
 public void start()
  {
   C3DCanvas canvas = new MyCanvas();
   Display.setCurrent( canvas );
  }
}

class MyCanvas extends C3DCanvas
{
 public void paint( C3DGraphics g3d ) {}
}