Next time, make new thread, since your post isn't relevant to Kim's.
To fix, you need to delete original folder for Feral Heart, you should still have original set up, yes? Just reinstall. Should be fixed, if you need help with the marking, after getting game fixed, try instructions one more time and if it doesn't work, I'll try to see what I can do to walk you through. Generally need to add marking file, and then add to the marking cfg. the same name of marking.