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java.lang.NullPointerException: 	at javax.swing.MultiUIDefaults.getUIError(MultiUIDefaults.java:117)	at javax.swing.UIDefaults.getUI(UIDefaults.java:721)	at javax.swing.UIManager.getUI(UIManager.java:860)	at javax.swing.JPanel.updateUI(JPanel.java:104)	at javax.swing.JPanel.(JPanel.java:64)	at javax.swing.JPanel.(JPanel.java:87)	at javax.swing.JPanel.(JPanel.java:95)	at javax.swing.JRootPane.createGlassPane(JRootPane.java:482)	at javax.swing.JRootPane.(JRootPane.java:313)	at javax.swing.JFrame.createRootPane(JFrame.java:247)	at javax.swing.JFrame.frameInit(JFrame.java:228)	at javax.swing.JFrame.(JFrame.java:195)	at oracle.ide.IdeCore$StartupWindow.(IdeCore.java:1458)	at oracle.ide.IdeCore.startupImpl(IdeCore.java:1084)	at oracle.ide.Ide.startup(Ide.java:672)	at oracle.ideimpl.Main.start(Main.java:49)	at oracle.ideimpl.Main.main(Main.java:25)