If you're getting the dreaded TypeError: “Nonetype object is not iterable" error but your troubleshoot objects says everything is valid, take a look at this video as a possible solution.
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https://www.youtube.com/watch?v=l2vdYwKnak8
All of my v3.0.0 woes have gone away with the just release v3.0.1. Oh Happy Day!!
https://inkstitch.org/docs/install/
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https://www.youtube.com/watch?v=EBydvE7M1Qg
Those that use Windows 10 seem to be having difficulties keeping Inkscape 1.1 running for very long. When doing intricate inkstitch projects that's bad, really bad. Try Inkscape 1.2, even though it isn't released yet. Details for how to use it with inkstitch are in this video.
And, here's the link to Inkscape 1.2 development version download page.
https://inkscape.org/release/inkscape-dev/
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https://www.youtube.com/watch?v=AhISNJrc5b8
Just one of my usual game sessions of Neverwinter Online playing my Warlock in a River District session. I'm using Manjaro Linux and Steam Proton, one of the easiest Linux for gaming systems I've ever set up.
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https://www.youtube.com/watch?v=1ib_IK2orTU