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java.lang.Error: 	at javax.swing.UIDefaults.getUIError(Unknown Source)	at javax.swing.UIDefaults.getUI(Unknown Source)	at javax.swing.UIManager.getUI(Unknown Source)	at javax.swing.JButton.updateUI(Unknown Source)	at javax.swing.AbstractButton.init(Unknown Source)	at javax.swing.JButton.(Unknown Source)	at javax.swing.JButton.(Unknown Source)	at javax.swing.plaf.basic.BasicOptionPaneUI.addButtonComponents(Unknown Source)	at javax.swing.plaf.basic.BasicOptionPaneUI.createButtonArea(Unknown Source)	at javax.swing.plaf.basic.BasicOptionPaneUI.installComponents(Unknown Source)	at javax.swing.plaf.basic.BasicOptionPaneUI$PropertyChangeHandler.propertyChange(Unknown Source)	at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(Unknown Source)	at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(Unknown Source)	at javax.swing.JComponent.firePropertyChange(Unknown Source)	at javax.swing.JOptionPane.setInitialValue(Unknown Source)	at javax.swing.JOptionPane.showOptionDialog(Unknown Source)	at javax.swing.JOptionPane.showMessageDialog(Unknown Source)	at javax.swing.JOptionPane.showMessageDialog(Unknown Source)	at LNFTest.main(LNFTest.java:15)