Sometimes rempy do not update the new files as it must do, which cause this kind of error. And the second time you start the game, it update the files and the error is gone.Hmm, maybe I just did something wrong when installing the mods. I'll try to install them again on a clean game folder and I'll post here if the error still persists.
Edit: Got the same error as slayer991 when I first tried to start the game but just starting the game the second time seems to have fixed it haha (this worked for both NhKPaNdA and SomeGuyWithNoImagination's mods). I might have confused the fix with that of changing the patch file.