Resolved Game-Modding Problems(Deus Ex: Human Revolution)

I need help. I am attempting to mod Deus Ex: Human Revolution Director's Cut", but I am having difficulties that are preventing me from doing so. For example, I get error messages when I try to mod a file extracted from my USB Flash Drive, saying "index was out of the bounds of the array" or "gamesave.sav file cannot be found or identified". Also, whenever I try to mod a file directly from my USB Flash Drive, nothing happenes. I try again, and another error message comes up, this time saying the selected file is "being used in another process". I am using 360Revolution for this, which I have used sucessfully before. But not much works anymore. Not even the Save Sharer. I would very much appreciate a solution to this problem.