Practice SAPUI5 problem

Hi all,

I am studying UI5 developer guide which on http://sapui5.netweaver.ondemand.com.

In the section of "Application Best Practices", Step 8. Master view.

When i added the code, "controllerName="sap.ui.demo.tdg.view.Master" in Master view, and run "Run As --> Web App preview", it became an empty view with blue background.

Is anyone have the same problems when you run this practice?

I would appreciate if anyone could give me some advises.

thanks

Allen