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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)