Comment 32 for bug 176750

I can reproduce the problem by renaming inkscape.exe to something else. So it looks like Ulferikson may be on the right track, insofar as the script's attempt to run Inkscape may be failing because inkscape.exe can't be found. But inkscape.exe isn't in the path on my machine, and yet the Envelope effect works, so there's more to it than this.

I'm attaching a modified version of summersnight.py that reports the message from stderr back to Inkscape on failure. If someone who is experiencing the problem could try the Envelope effect with this summersnight.py, and report the result, it would clarify what is happening.