DramaLlama

I can play vanilla minecraft with no problems at all, but as soon as I try to launch forge (I've tried 1.6.4 and 1.12.2), it crashes. I just don't know what to do anymore, somebody please help? Roughly translated the error report says: error game crash: an unexpected problem happened and the game crashed. We apologize for the inconvenience. (My minecraft's in German so I had to translate)