I’m not an inkscape user, so I can only be of limited assistance here. I have seen folks have issues with the extension before. Here is a somewhat recent thread where someone was helped with the living hinge generator extension:
You may be able to edit an existing living hinge pattern to suit your needs.
(That’s what I usually do.)
Some good living hinges files here:
this thread has some free living hinge files:
the link in this thread has some more:
Since this is an inkscape issue, not a glowforge issue, I am going to move the post out of Problems and Support.