Yesterday I deleted my Respawn folder under my saved games (users/USER/savedgames/Respawn) because it wouldn't uncheck from "read only" mode, however now the game isn't generating me a new Respawn ...
Try creating a new Respawn folder, it's possible that it'll need that to generate the new files.
Something that would most likely fix it is completely reinstalling the game, though there are probably other ways to make it work again.
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