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java.lang.NullPointerException: 	at javax.swing.MultiUIDefaults.getUIError(MultiUIDefaults.java:117)	at javax.swing.UIDefaults.getUI(UIDefaults.java:741)	at javax.swing.UIManager.getUI(UIManager.java:1012)	at javax.swing.JOptionPane.updateUI(JOptionPane.java:1859)	at javax.swing.JOptionPane.(JOptionPane.java:1822)	at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:841)	at javax.swing.JOptionPane.showConfirmDialog(JOptionPane.java:779)	at javax.swing.JOptionPane.showConfirmDialog(JOptionPane.java:741)	at robocode.AutoExtract.main(Unknown Source)