I switched back to 4.1.1 and realized why my game kept being canceled. It didn't show me the error until I switched back to 4.1.1.
The problem was that there was no background assigned to one of my scenes. I've posted the issue on GitHub.
Thanks Levi! I've just released 4.1.3 which includes a few more bug fixes and make sure this error appears correctly again :-) The error message now also includes a link that you click to jump to the scene that has the missing background
