Which version of Inkscape do you have installed? (See Inkscape menu 'Help > About Inkscape')
> dxf_input.py (25.1 KiB, text/x-python)
AFAICT the attached version of 'dxf_input.py' doesn't exactly match any version distributed with stable releases of Inkscape 0.48.x - did you install a custom version of the python script?
> I am using lnkscape in linux.
Which version of Inkscape do you have installed? (See Inkscape menu 'Help > About Inkscape')
> dxf_input.py (25.1 KiB, text/x-python)
AFAICT the attached version of 'dxf_input.py' doesn't exactly match any version distributed with stable releases of Inkscape 0.48.x - did you install a custom version of the python script?