Found this solution in another post by Adrian, applied the edit he suggested and chamfer gadget now works fine,
THANKS to Adrian...
Re: chamfer gadget 1.3 doesn't work in v. 9.012
Unread postby Adrian » Tue Dec 05, 2017 4:48 pm
The installation path is correct as far as I know. It's only gadgets that have support files or have multiple steps that install into a sub-directory. Simple stand alone ones have always installed in the root folder for the program version in gadgets.
The problem with the nil value is caused by a bit of development code that looks like it's been left in the file by error. If you edit the chamfer.lua file (notepad works fine if you don't have any other editor) and put -- before the line which says require("mobdebug").start() and save the file it will then work