screensaver tutorial project

I have opened the new project screensaver and even if in the guide it is written:

Once your project is loaded into the Visual Basic environment, you can compile and run the program in one step.

To build and run the Screen Saver application

Press F5 to build and start the screen saver under the debugger.

The screen saver launches and starts displaying the most recent articles from the RSS feed. Pressing a key or moving the mouse causes the screen saver to exit

I have the following error:

A first chance exception of type 'System.Configuration.ConfigurationErrorsException' occurred in System.Configuration.dll

A first chance exception of type 'System.InvalidOperationException' occurred in screensaver1.exe

Why

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