I've got a question about NodeFactory. From an example on Umbraco TV, I have the following code 

 using umbraco.presentation.nodeFactory;

Node currentPage = Node.GetCurrent();

 foreach(Node page in currentPage.Children)

            {

                Response.Write(page.Name);

            }

However, it seems the Node class is obsolete.  So, I tried with the umbraco.NodeFactory class and I get an error - 

The type 'umbraco.interfaces.INode' is defined in an assembly that is not referenced. You must add a reference to assembly 'interfaces, Version=1.0.4029.25827, Culture=neutral, PublicKeyToken=null'.

My version info is: umbraco v 4.6.1 (Assembly version: 1.0.4029.25836)

I know that there is a version mismatch but not sure what to do to correct it (or should I just go back to the obsolete method). 

Thanks for any help.