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java.lang.NullPointerException: 	at com.mediocre.game.Screen.PlayScreen.render(PlayScreen.java:33)	at com.badlogic.gdx.Game.render(Game.java:46)	at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:206)	at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:114)