Getting a fatal error on launch

So i installed a couple mods and they run fine if i launch the game through the .exe in the steam folder but for some reason openmw cannot find that and when i launched it there were no save files, i tried to look it up online and people said to install openmw into the steam folder and now that ive done that im getting a fatal error on launch, i can still play with the mods through the .exe but i want to use openmw also, this is probably a really easy fix but i am not that familiar with modding