Game crashes.

[bartman2525]

Hi guys, i would first like to point out that i have played this for at least 30 hours with no mods. so after i tried to enable "developer" mode after watching a You Tube video showing how to do it, my game went to a black screen then when i tabbed out this error showed. i have closed restarted he game with the same result and restarted my PC with the same result. i have re-installed the game but the same thing happened  black screen then error message.

what do i do ?

Any help would be much appreciated.