[vtkusers] Please answer my question!Thank you !

[taofang829]

My question is :
    When I run my programm,it pop up a dialog ,it said "ERROR: In C:\Program Files\VTK4.4\Rendering\vtkWin32RenderWindowInteractor.cxx, line 128
vtkWin32RenderWindowInteractor (0x01A82700): No renderer defined!"

And when I move my mouse ,it repeated the words that I mentioned above.

Why?

Thank You!
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