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java.lang.NullPointerException: 	at com.droidquest.devices.DirectionalSensor.Function(DirectionalSensor.java:51)	at com.droidquest.RoomDisplay.Electricity(RoomDisplay.java:382)	at com.droidquest.RoomDisplay$5.actionPerformed(RoomDisplay.java:232)	at javax.swing.Timer.fireActionPerformed(Timer.java:313)	at javax.swing.Timer$DoPostEvent.run(Timer.java:245)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)