I am sure that there are many fellow modders in the world of fallout new vegas, so i would like to ask if anyone has experinced an issue i am experiencing, lets say you go up to a door like the doors in hidden valley leading to any other bunker, and instead of a door its a blackness instead of a door, with no door, there is no entry to a new cell though you can walk right through the black space where a door should be.
anyone know a solution to this, I deactivated every mod and i think i reinstalled my fallout new vegas, though i can try again.

Sounds like the game is having an issue so it's not your mods, try going to the geck and finding the door and see if it shows up. Also if your using steam you can always verify game cache.

Verify your cache, sort your load order with LOOT, or adjust your settings? Do you use a ENB and if so which one?

Are you install mods lately i have an problem like this at fallout 3 from one of the mods try to disable all mods and start a new game and check it