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java.lang.NullPointerException: 	at java.awt.Container.remove(Container.java:470)	at nfl.Nfl$3.actionPerformed(Nfl.java:115)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)	at javax.swing.AbstractButton.doClick(AbstractButton.java:279)	at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:886)	at java.awt.Component.processMouseEvent(Component.java:3715)	at java.awt.Component.processEvent(Component.java:3544)	at java.awt.Container.processEvent(Container.java:1164)	at java.awt.Component.dispatchEventImpl(Component.java:2593)	at java.awt.Container.dispatchEventImpl(Container.java:1213)	at java.awt.Component.dispatchEvent(Component.java:2497)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2451)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2216)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2125)	at java.awt.Container.dispatchEventImpl(Container.java:1200)	at java.awt.Window.dispatchEventImpl(Window.java:926)	at java.awt.Component.dispatchEvent(Component.java:2497)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)