I'm trying to make my self a lasercutter from scratch.
The design is made, and as a first step in making the dream come true

I had found a very useful instructable in which software was recommended:
inkscape in combination with the lasercutter extention or the 305 engineering extention.
Installed all as to the description in the instructable, but am running into issues. On both extentions I get this error when generation G-code:
(see picture attached)
I have tried finding sollutions on line, but none have helped...
anybody have an idea what I can do?
Thx a bunch
Tom