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java.lang.ArrayIndexOutOfBoundsException: -1	at org.jbox2d.collision.BroadPhase.moveProxy(	at org.jbox2d.collision.Shape.synchronize(	at org.jbox2d.dynamics.Body.synchronizeShapes(	at org.jbox2d.dynamics.World.solve(	at org.jbox2d.dynamics.World.step(	at	at Source)