Yeh it has something to do with the icon (i made another topic post here
iv tryed many different versions of godot and also most recent an all have this error.
This also happens without even deleting the dafault icon, im running runing windows7 on this PC maybe that could be the problem? as im thinking it could be more down to something like that and as the OP mentioned it was down to his pc but never revealed there fix i cant be sure.