[vtkusers] vtkVRMLImporter::DeleteObject problem

[Moti Freiman]

Hello!

i'm trying to read vrml files with vtkVRMLimporter, but while reading 
i've got the execption:
An unhandled exception of type 'System.NullReferenceException' occurred 
in "laser_test.exe"
Additional information: Object reference not set to an instance of an 
object.
this execption occurred while the function: 
vtkVRMLImporter::DeleteObject trying to delete the obj object.
additional information: my vrml files given as vrml1.0, and i converted 
them to vrml2.0 using vrealm builder (provided with matlab).
thank you.

Moti Freiman.
Medical Image Processing and Computer-Assisted Surgery Laboratory.
School of Computer Science and Engineering.
The Hebrew University of Jerusalem Givat Ram, Jerusalem 91904, Israel 
Phone: +(972)-2-658-5371 (laboratory) E-mail: freiman at cs.huji.ac.il 
WWW site: http://www.cs.huji.ac.il/~freiman