How to Solve NullPointerException in WebService handling

hi experts,
>> I am in initial stage in Web Dynpro
>> I created one webservice ( just Add to number)
>> My Nodes Structure is
            AddNode
             !____AddInput_Node
                     !---Num1
                     !---Num2
             !____AddOutput_node
                    !---result
I set Cordinality 1-1 to all nodes
When I run my application , i got NullPointerException error
how to solve this error
Pl can one help me...
Advance Thanks
Balaji

Hi ,
The problem is not with the model , in the context you have to intantiate the node to which the context is binded .
Kindly look at the following learning material
https://www.sdn.sap.com/irj/sdn/webdynpro?rid=/library/uuid/49f2ea90-0201-0010-ce8e-de18b94aee2d#63
regards
Dhawal

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