Welcome to the forum!
This article will tell you how to make a screenshot, without using a camera:
https://forum.inkscapecommunity.com/index.php?action=articles;sa=view;article=12 Just for future reference
Regarding the message box that you showed in your photo, we can't see the entire error message. Please try to make the gcode again, and when you get the box with the Traceback error message, do this
-- put your cursor inside where the text is and click once
-- Ctrl + a (select all) (this will highlight all the text)
-- Ctrl + c (copy)
Paste that into your next message. Then we can see the whole error message.
Also, please tell us which extension you are using to generate the gcode. It looks like you might be using this one?
http://www.thingiverse.com/thing:5986 (Unicorn)
However, even after we can see the whole error message, we might not be able to help. In the end, you might have to contact the person who wrote that extension, and report the error message to them. Then they can either tell you what to do, or they can fix it.
Or, Inkscape has other extensions that will generate gcode. I'm not sure if they would work with your machine. But it might.
