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java.lang.NullPointerException: 	at java.awt.Container.addImpl(Unknown Source)	at java.awt.Container.add(Unknown Source)	at undefined.Tab1.(tab1.java:38)	at undefined.Tab1.createAndShowGUI(tab1.java:95)	at undefined.Tab1.access$000(tab1.java:5)	at undefined.Tab1$1.run(tab1.java:108)	at java.awt.event.InvocationEvent.dispatch(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)