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

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This exception has no message.
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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 com.jim.league.view.CreateLeagueFrame.init(CreateLeagueFrame.java:38)

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