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java.lang.IllegalArgumentException: input == null! at javax.imageio.ImageIO.read(ImageIO.java:1338) at gui.PointPanel.loadImage(MainFrame.java:222) at gui.PointPanel.<init>(MainFrame.java:161) at gui.MainFrame.jbInit(MainFrame.java:64) at gui.MainFrame.<init>(MainFrame.java:51) at gui.ElecCtrl.<init>(ElecCtrl.java:20) at gui.ElecCtrl.main(ElecCtrl.java:50)