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java.lang.NullPointerException: 	at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:50)	at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:736)	at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2755)	at sun.awt.image.ImageRepresentation.drawToBufImage(ImageRepresentation.java:726)	at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:743)	at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2755)	at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2745)	at javax.swing.ImageIcon.paintIcon(ImageIcon.java:322)	at javax.swing.plaf.basic.BasicButtonUI.paintIcon(BasicButtonUI.java:306)	at javax.swing.plaf.basic.BasicButtonUI.paint(BasicButtonUI.java:248)	at com.sun.java.swing.plaf.windows.WindowsButtonUI.paint(WindowsButtonUI.java:152)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)	at javax.swing.JComponent.paintComponent(JComponent.java:541)	at javax.swing.JComponent.paint(JComponent.java:808)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paint(JComponent.java:817)	at javax.swing.JLayeredPane.paint(JLayeredPane.java:557)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4802)	at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4748)	at javax.swing.JComponent.paint(JComponent.java:798)	at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)	at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)	at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)	at java.awt.Container.paint(Container.java:1312)	at sun.awt.RepaintArea.paint(RepaintArea.java:177)	at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:260)	at java.awt.Component.dispatchEventImpl(Component.java:3678)	at java.awt.Container.dispatchEventImpl(Container.java:1627)	at java.awt.Window.dispatchEventImpl(Window.java:1606)	at java.awt.Component.dispatchEvent(Component.java:3477)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)