java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at javagame.Game.initStatesList(Game.java:23)
at org.newdawn.slick.state.StateBasedGame.init(StateBasedGame.java:164)
at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:393)
at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:317)
at javagame.Game.main(Game.java:35)

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