ahztek weapon overhaul scope fix

[RedMonarch]

so i installed the shrapnel 4.1 ahztek weapon overhaul and when i zoom in with guns that use a scope a get a red exclamation mark, but this happens with certain guns not all of them, for example the famas brII. When i check the files there is one called Famas BRII + Scope.nif, so the file is actually there but for some reason it's not working properly, can anyone help me out here?