I think perhaps the TeamPulse Service Reference in your project is out of date. Could you please try the following and report back the results?
1) In Visual Studio, with your project open, expand the Service References folder so that the TeamPulse node is exposed.
2) Right-click the TeamPulse service reference node and choose "Update service reference" from the context menu that appears.
3) Rebuild and run your application.
I have attached a screenshot depicting the context menu and selection.
the Telerik team