Having used PCB-GCODE for more than 6 years and seen that an new updated Version 3.6.6 was available, I decided to download and give it a try.?? Not wishing to damage the original running version, I installed it in my "Downloads" folder.
Starting the setup ulp from an existing Eagle design appeared problem free and I was able to set up all parameters without any problems, however as soon as I clicked on "Accept and make my board" an error pop up appeared!!? I've no idea what this file is about or how I should create it. See attached screen shot
Fortunately reverting back to? Rev 3.6.2.4 was problem free, apart from some of the machine parameters having been "fiddled" with in the interim

!!
Please can someone lighten my darkness.
Thanks