java.lang.IllegalArgumentException: input == null!

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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.(MainFrame.java:161)
at gui.MainFrame.jbInit(MainFrame.java:64)
at gui.MainFrame.(MainFrame.java:51)
at gui.ElecCtrl.(ElecCtrl.java:20)
at gui.ElecCtrl.main(ElecCtrl.java:50)

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