Fusion 360 Error invalid target

[WillAdams (William Adams (Carbide 3D))]

Please see:

Fixing GRBL's G2/G3 Arc Errors in Fusion360

Arc Error Explanation: Hey guys, after a lot of research and testing, I’m happy to announce that we have a definitive answer about why arc errors are happening, and how you can fix them for good. Basically, the start and endpoints don’t line up to the last decimal, and GRBL doesn’t like that. An updated post processor has been released that ensures GRBL gets perfect arc points. See the linked video for full details. Updated post processor here: https://cam.autodesk.com/hsmposts