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java.lang.IllegalArgumentException: im == null!	at javax.imageio.ImageIO.write(ImageIO.java:1483)	at com.rgb.MapImagePanel.displayLayers(MapImagePanel.java:128)	at com.rgb.MapImagePanel.(MapImagePanel.java:73)	at com.rgb.RGBSpliter.main(RGBSpliter.java:91)