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making an Interface / Error: Object reference not set to an instance of an object

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I am using a few classes  of the OPC foundation and one of the classes needs a interface:

      EmptyNodeManager Node = new EmptyNodeManager(IServertemp, configuration1);

IServertemp is a  IServerInternal.

so I am getting error saying that 

it getting be error:

Object reference not set to an instance of an object

I think it is because i am not setting up IServerInternal right


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