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That error seems to indicate that it doesn't recognize something in your skill tree build. Which build are you using, and did you do anything unusual like combine skill trees?
Ok I'am pretty sure I just figured this out. Go to windows control panel > region and language > formats. On the formats tab change from turkish? to english(US) and you should be good to go. I tested changing from english(US) to turkish and whenever I did that I would get the exact same error you are getting.