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java.lang.NullPointerException: 	at ListNode.InsertAfter(ListNode.java:12)	at NameList.AddToFront(NameList.java:60)	at NameList.Insert(NameList.java:40)	at NameList.main(NameList.java:109)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)