java.lang.NullPointerException: This exception has no message.

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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)

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