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java.lang.NullPointerException: 	at javax.swing.MultiUIDefaults.getUIError(MultiUIDefaults.java:117)	at javax.swing.UIDefaults.getUI(UIDefaults.java:736)	at javax.swing.UIManager.getUI(UIManager.java:1012)	at javax.swing.JPanel.updateUI(JPanel.java:109)	at javax.swing.JPanel.(JPanel.java:69)	at javax.swing.JPanel.(JPanel.java:92)	at javax.swing.JPanel.(JPanel.java:100)	at javax.swing.JRootPane.createGlassPane(JRootPane.java:527)	at javax.swing.JRootPane.(JRootPane.java:347)	at javax.swing.JDialog.createRootPane(JDialog.java:617)	at javax.swing.JDialog.dialogInit(JDialog.java:599)	at javax.swing.JDialog.(JDialog.java:266)	at javax.swing.JDialog.(JDialog.java:193)	at javax.swing.JDialog.(JDialog.java:141)	at robocode.AutoExtract.acceptReject(Unknown Source)	at robocode.AutoExtract.acceptLicense(Unknown Source)	at robocode.AutoExtract.main(Unknown Source)