java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at javax.swing.plaf.basic.BasicTextUI$RootView.paint(BasicTextUI.java:1167)
at javax.swing.plaf.basic.BasicTextUI.paintSafely(BasicTextUI.java:523)
at javax.swing.plaf.basic.BasicTextUI.paint(BasicTextUI.java:657)
at javax.swing.plaf.basic.BasicTextUI.update(BasicTextUI.java:636)
at javax.swing.JComponent.paintComponent(JComponent.java:395)
at javax.swing.JComponent.paint(JComponent.java:687)
at javax.swing.JComponent.paintChildren(JComponent.java:498)
at javax.swing.JComponent.paint(JComponent.java:696)
at javax.swing.JComponent.paintChildren(JComponent.java:498)
at javax.swing.JComponent.paint(JComponent.java:696)
at javax.swing.JComponent.paintChildren(JComponent.java:498)
at javax.swing.JComponent.paint(JComponent.java:696)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:546)
at javax.swing.JComponent.paintChildren(JComponent.java:498)
at javax.swing.JComponent.paint(JComponent.java:669)
at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:23)
at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:54)
at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:91)
at java.awt.Container.paint(Container.java:960)
at sun.awt.RepaintArea.paint(RepaintArea.java:298)
at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:196)
at java.awt.Component.dispatchEventImpl(Component.java:2663)
at java.awt.Container.dispatchEventImpl(Container.java:1213)
at java.awt.Window.dispatchEventImpl(Window.java:914)
at java.awt.Component.dispatchEvent(Component.java:2497)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)

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