Thank you for your speedy reply. I looked at the Milhouse thread, and it seems as though I need a working copy of LibreELEC on the unit before I can install the development build. As a noob, not sure I want to deal with that anyway. Again, Thanks.
I just completed a new build using an Asrock Z370M-ITX board and Intel i3-8100 processor. It is my understanding that the i3 is also the GPU. When I installed using the generic AMD/Intel/Nvidia file, I got the above message.