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java.lang.NullPointerException: 	at javax.swing.DefaultDesktopManager.maximizeFrame(Unknown Source)	at javax.swing.plaf.basic.BasicInternalFrameUI.maximizeFrame(Unknown Source)	at javax.swing.plaf.basic.BasicInternalFrameUI$InternalFramePropertyChangeListener.propertyChange(Unknown Source)	at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(Unknown Source)	at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(Unknown Source)	at javax.swing.JComponent.firePropertyChange(Unknown Source)	at javax.swing.JInternalFrame.setMaximum(Unknown Source)	at com.jim.league.view.CreateLeagueFrame.init(CreateLeagueFrame.java:38)