There is a preferences error where it fails to locate the defaults. I assume that deleting the entire folder was the problem as instructed on the reddit, was the problem for this particular error.
I had the "Script error when execing: 'Main.cs"." error pop up upon pressing play on the launcher. I was told to delete my Preference folder and that it would re download the folder. I started up the launcher, pressed play, then It said "Could not create Font". My launcher was closed and the...