[vtkusers] Problem with vtkRenderWindowInteractor (Please, urgent!)

[yfl at doc.ic.ac.uk]

Dear Varshini and all,

I'm writing a program which has a point picking function. However, when I run 
it, it gives me an error message about vtkRenderWindowInteractor:

"Object named: iren, could not find requested method: ConfigureEvent or the 
method was called with incorrect arguments."

I also use vtkTkRenderWidget in my program:

****** part of the program *******
vtkRenderer renderer
    renderer AddActor mandible_actor	
    renderer AddActor pointer_actor
    renderer SetBackground 0.1 0.2 0.4

vtkRenderWindow renWin
    renWin AddRenderer renderer

vtkPointPicker pointPicker
    pointPicker AddObserver EndPickEvent pointPick

vtkRenderWindowInteractor iren
    iren SetRenderWindow renWin
    iren SetPicker pointPicker

set vtkw [vtkTkRenderWidget .ren \
        -width 500 \
        -height 500 \
        -rw renWin]

#
# Setup Tk bindings and VTK observers for that widget.
#
::vtk::bind_tk_render_widget $vtkw

frame .params

button .params.reset -text "Reset" -command reSet

set pc1 [scale .params.pc1 \
        -from 1 -to 10 -res 1 \
        -orient horizontal \
        -label "1st Principal Component" \
        -command setPC1]
$pc1 set 1

proc setPC1 {res} {}
***********************************

I have checked the Archives, Varshini also had this problem on 1 June 2004, 
but there was no reply for this problem. If Varshini had solved it, could you 
please tell me how to solve this problem? Or if anyone know, could you please 
reply this email?

Thanks very much

Best wishes,
Krista