I get an error also, but a different one. Mine is "Radius to end of arc differs from radius to startline 7". Your code does not have a "Y" position before the G3, so Mach is really at a loss as to what to do. I simply added a "Y0.0" on line 6. There is also an error on line 170. It reads "N170M) M5 (tool change .5 straight rough)" Take out the "M)" after N170.