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java.lang.NullPointerException: 	at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:50)	at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:749)	at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2803)	at sun.awt.image.ImageRepresentation.drawToBufImage(ImageRepresentation.java:726)	at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:756)	at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2803)	at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2793)	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 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:552)	at javax.swing.JComponent.paintChildren(JComponent.java:647)	at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4778)	at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4724)	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:1309)	at sun.awt.RepaintArea.paint(RepaintArea.java:177)	at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:260)	at java.awt.Component.dispatchEventImpl(Component.java:3699)	at java.awt.Container.dispatchEventImpl(Container.java:1623)	at java.awt.Window.dispatchEventImpl(Window.java:1590)	at java.awt.Component.dispatchEvent(Component.java:3480)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:140)	at java.awt.Dialog.show(Dialog.java:538)	at java.awt.Component.show(Component.java:1134)	at java.awt.Component.setVisible(Component.java:1089)	at InfoDialog.setObjVisible(InfoDialog.java:276)	at ObjectModel.displayObject(ObjectModel.java:412)	at TaskPanel.openRefObject(TaskPanel.java:746)	at TaskPanel.access$000(TaskPanel.java:43)	at TaskPanel$1.mouseClicked(TaskPanel.java:118)	at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:208)	at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:207)	at java.awt.Component.processMouseEvent(Component.java:5137)	at java.awt.Component.processEvent(Component.java:4931)	at java.awt.Container.processEvent(Container.java:1566)	at java.awt.Component.dispatchEventImpl(Component.java:3639)	at java.awt.Container.dispatchEventImpl(Container.java:1623)	at java.awt.Component.dispatchEvent(Component.java:3480)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3174)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)	at java.awt.Container.dispatchEventImpl(Container.java:1609)	at java.awt.Window.dispatchEventImpl(Window.java:1590)	at java.awt.Component.dispatchEvent(Component.java:3480)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)