Thx you vary much it works now!

ok my specs |3.2 ghz intel core i3|Memory 8gb| ATI Radeon HD 5670 512 MB graphics | OS X 10.9.5 {Yosemite} |and log ...

If it is working on your think and not mine my computer might have autism btw witch operating system do you have?

Well Brunenstein telling me that does not help my problem so... ps i use a 2010 IMac

So I saw a youtuber playing this game and so i am like "that looks cool!"
so I downloaded the demo on steam it just said error some i am like ok... then
I downloaded off of the Factorio Site and still stopped a mods 10% Plz help Ps. first time trying to use it