java.lang.NullPointerException

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    • java.lang.NullPointerException at AllLights.mouseUp(AllLights.java:78) at 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)
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