[vtkusers] could not find requested method: GetOutputPort

[nanbuwks]

Hi all.

I get vtk4.2.6, and installed to fedora core 3 linux.
Next,I downloaded "warplens.tcl" for sample from http://www.vtk.org/doc/release/4.2/html/c2_vtk_t_7.html#c2_vtk_t_vtkPNGReader
.

Error occored as below:
$ bin/vtk ../../warplens.tcl
Error in startup script: Object named: pngReader, could not find requested method: GetOutputPort
or the method was called with incorrect arguments.

    while executing
"pngReader GetOutputPort"
    invoked from within
"gf SetInputConnection [pngReader GetOutputPort]"
    (file "../../warplens.tcl" line 21)

Could anyone please point me to the way to solve this problem.

Yoshimasa.K / Nanbu works Inc.