[Paraview] Representation

[Luca Cinquepalmi]

Hi all,
I'm trying to load a vtk file in Paraview using a simple python script. 
My script is:

from paraview.simple import *
obj = 
OpenDataFile("/home/luca/3dVoxView/Volumes_Storage/geostat_interp/Vol.vtk")
obj.Representation = 'Volume'
servermanager.SaveState("/home/luca/3dVoxView/Volumes_Storage/geostat_interp/prova.pvsm")

but when I run my script this error appears:

Traceback (most recent call last):
   File "paraviewProj.py", line 3, in <module>
     obj.Representation = 'Volume'
   File 
"/home/luca/3dVoxView/PARAVIEWWEB/build-paraview/Utilities/VTKPythonWrapping/site-packages/paraview/servermanager.py", 
line 207, in __setattr__
     "to add this attribute.")
AttributeError: Attribute Representation does not exist.  This class 
does not allow addition of new attributes to avoid mistakes due to 
typos. Use add_attribute() if you really want to add this attribute.

what does it mean? what's wrong in obj.Representation='Volume' ? Thank 
you for any suggestion...

Luca
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