I used to get the same error using the latest Inkscape EXE, while Ghostscript wasn't installed, but after installing it the error is was gone . Also, one can have problems if MikTeX is installed using a limited account. I will try using a limited account later, but I am pretty sure I made a poster full of latex equations using Inkscape from a limited account...
> It works (sort of -- see below)! This is fabulous functionality.
> Thanks to those respsonsible.
> fine print: It only works if I start Inkscape from an Administrator
> account. If I start it from a user account, I get the following python
> Traceback (most recent call last):
> File "share\extensions\eqtexsvg.py", line 121, in ?
> File "C:\Program Files\multimedia\Inkscape\share\extensions\inkex.py",
> line 123, in affect
> File "share\extensions\eqtexsvg.py", line 107, in effect
> svg_open(self, svg_file)
> File "share\extensions\eqtexsvg.py", line 54, in svg_open
> IndexError: pop from empty list
> I program in python, so I'll take a look and see if I can figure
> anything out.
> Which brings up a question that I'll start a new thread for ...
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