Error starting stand alone app

[Mazahacker]

When I starting stand alone app, app ends  ------>  close app or debug app. (Standart ending error app)

Win 10, core i7, 16 gb, gtx 1070

[Josh]

One common mistake is when people create a project with no map called "start,map", thinking that the game will just load whichever was the last map they had open in the editor.