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Is it possible to change the apperance of the existing characters in paint?
Because yesterday I got the human character that I edited to be the one i made when it stood still. But today I did more of them and there is an error when I try to start the game up why would it work and then not work again?

Well, the error message says that the file could not be found in the external folder. Did you check already if it is there (or if maybe the earlier version of this character is there but not the changed one)? This is just my first idea when I see your error message.