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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)