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java.lang.NullPointerException: 	at javax.swing.MultiUIDefaults.getUIError(Unknown Source)	at javax.swing.UIDefaults.getUI(Unknown Source)	at javax.swing.UIManager.getUI(Unknown Source)	at javax.swing.JPanel.updateUI(Unknown Source)	at javax.swing.JPanel.(Unknown Source)	at javax.swing.JPanel.(Unknown Source)	at javax.swing.JPanel.(Unknown Source)	at javax.swing.JRootPane.createGlassPane(Unknown Source)	at javax.swing.JRootPane.(Unknown Source)	at javax.swing.JFrame.createRootPane(Unknown Source)	at javax.swing.JFrame.frameInit(Unknown Source)	at javax.swing.JFrame.(Unknown Source)	at com.jivesoftware.Spark.(Spark.java:53)	at com.jivesoftware.Spark.(Spark.java:37)	at com.jivesoftware.Spark$1.run(Spark.java:117)	at java.awt.event.InvocationEvent.dispatch(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)