java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at undefined.ListNode.InsertAfter(ListNode.java:12)
at undefined.NameList.AddToFront(NameList.java:60)
at undefined.NameList.Insert(NameList.java:40)
at undefined.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)

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