Custom story crashes whole game

[CQBgamer]

Its one that I'm making. I did several integrity checks and re installed the whole game. There arent any files I used on it that I wouldn't have, as the map is literally just a floor and a box light. Im just trying to see if my image looks ok in the CS description and when I click on it in the Custom Story menu to load it, the game crashes before I even get to the description menu.