I just downloaded the JSawyer mod, but when i try to launch the game, it crashes immediately. If i run it without the mod, it runs perfectly fine and i only have 1 Mod(BrotherhoodHouseAlliance) running at the same time(although disabling it still returns the same result).

Is this a problem often encountered? and how do i fix this?

Most likely a missing master. If memory serves, Sawyer's mod requires all DLCs and pre-order packs. Do you have them all, and are they enabled?

Yes i have all the dlc + GRA + Courierst Stash installed and active

Well, that's weird. Sawyer's is loading last too, i assume?

Only other reason i know that can cause crash on startup are messed up menu files, but then it would crash all the time.

Can't really then suggest anything else but to try it with a clean install of the game