.obj load fail


so, i wanted to modify the loading procedure for the advanced car example, i got this function from the hello obj tutorial, slightly modified:

    public static Node loadModelObj( String path ) {
       try {
          URL model = new URL( resourceSearchPath, path );
   // Create something to convert .obj format to .jme
   FormatConverter converter = new ObjToJme();
   // Point the converter to where it will find the .mtl file from
   converter.setProperty("mtllib", model);
   // This byte array will hold my .jme file
   ByteArrayOutputStream BO = new ByteArrayOutputStream();

      // Use the format converter to convert .obj to .jme
      converter.convert(model.openStream(), BO);
      Node maggie = (Node) BinaryImporter.getInstance().load(   new ByteArrayInputStream(BO.toByteArray()));
      // shrink this baby down some
      maggie.setModelBound(new BoundingSphere());
      // Put her on the scene graph
      return maggie;
   } catch (IOException e) { // Just in case anything happens
          return null;

and it generates this error:
21.04.2010 19:26:29 class com.jmetest.physics.vehicle.TestAdvancedVehicle start()
SCHWERWIEGEND: Exception in game loop
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at com.jmex.model.converters.ObjToJme.buildStructure(ObjToJme.java:257)
at com.jmex.model.converters.ObjToJme.convert(ObjToJme.java:160)
at com.jmetest.physics.vehicle.Util.loadModelObj(Util.java:109)
at com.jmetest.physics.vehicle.Car.createChassi(Car.java:101)
at com.jmetest.physics.vehicle.Car.<init>(Car.java:60)
at com.jmetest.physics.vehicle.TestAdvancedVehicle.createCar(TestAdvancedVehicle.java:95)
at com.jmetest.physics.vehicle.TestAdvancedVehicle.simpleInitGame(TestAdvancedVehicle.java:77)
at com.jme.app.BaseSimpleGame.initGame(BaseSimpleGame.java:545)
at com.jme.app.BaseGame.start(BaseGame.java:74)
at com.jmetest.physics.vehicle.TestAdvancedVehicle.main(TestAdvancedVehicle.java:166)

i put the .obj file into the

so, how do i check if the bytestream was read correctly ?!
or what is the failure here ?!

i cretead a .obj file without materials

thanks in advance

You have esported a file .mtl with file .obj???

i ommited the .mtl file, but will try with a .mtl file now, will post result here!