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java.lang.NullPointerException: 	at project7.NumberPanel.commence(NumberPanel.java:43)	at project7.NumberPanel$myMouseListener.mouseClicked(NumberPanel.java:54)	at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)	at java.awt.Component.processMouseEvent(Component.java:6044)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)	at java.awt.Component.processEvent(Component.java:5806)	at java.awt.Container.processEvent(Container.java:2058)	at java.awt.Component.dispatchEventImpl(Component.java:4413)	at java.awt.Container.dispatchEventImpl(Container.java:2116)	at java.awt.Component.dispatchEvent(Component.java:4243)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3995)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)	at java.awt.Container.dispatchEventImpl(Container.java:2102)	at java.awt.Window.dispatchEventImpl(Window.java:2440)	at java.awt.Component.dispatchEvent(Component.java:4243)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)