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This exception has no message.
java.lang.NullPointerException: 	at undefined.AllLights.mouseUp(AllLights.java:78)	at undefined.AllLights$1ButtonListener.actionPerformed(AllLights.java:47)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2167)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)	at java.awt.Component.processMouseEvent(Component.java:5465)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3089)	at java.awt.Component.processEvent(Component.java:5230)	at java.awt.Container.processEvent(Container.java:1961)	at java.awt.Component.dispatchEventImpl(Component.java:3933)	at java.awt.Container.dispatchEventImpl(Container.java:2019)	at java.awt.Component.dispatchEvent(Component.java:3781)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4205)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3885)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3815)	at java.awt.Container.dispatchEventImpl(Container.java:2005)	at java.awt.Window.dispatchEventImpl(Window.java:1764)	at java.awt.Component.dispatchEvent(Component.java:3781)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)