(ingame) Whenever i make a custom area i can get into the area via door; but when i try to exit back out(even after linking the door both ways), my game crashes. and ideas why? I am using 2 mods atm that link into this mod, a weapon mod and a armor one. i can get in my custom area just fine and the Npcs and are set with the right armor and guns; and both mods are also loaded when i do this ingame. Also the landscape that i am using is tLandscape, idk if this might be why it crashes or not.

One mod cannot mod another mod. That may be your problem. And by mod, I mean the ESP files.
You can 'trick' the game into doing it, but without more info from you I could not assume you had done that.