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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.<init>(JPanel.java:69) at javax.swing.JPanel.<init>(JPanel.java:92) at javax.swing.JPanel.<init>(JPanel.java:100) at javax.swing.JRootPane.createGlassPane(JRootPane.java:527) at javax.swing.JRootPane.<init>(JRootPane.java:347) at javax.swing.JDialog.createRootPane(JDialog.java:617) at javax.swing.JDialog.dialogInit(JDialog.java:599) at javax.swing.JDialog.<init>(JDialog.java:266) at javax.swing.JDialog.<init>(JDialog.java:193) at javax.swing.JDialog.<init>(JDialog.java:141) at robocode.AutoExtract.acceptReject(Unknown Source) at robocode.AutoExtract.acceptLicense(Unknown Source) at robocode.AutoExtract.main(Unknown Source)