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java.lang.NullPointerException
java.lang.NullPointerException: 	at javax.swing.SwingUtilities.getWindowAncestor(SwingUtilities.java:135)	at javax.swing.plaf.metal.MetalRootPaneUI.installWindowListeners(MetalRootPaneUI.java:220)	at javax.swing.plaf.metal.MetalRootPaneUI.installClientDecorations(MetalRootPaneUI.java:275)