I am facing a problem recently, although i created many menus for different projects,
But now when i test it as a stand alone, and create the "New slide menu", i wanted to use a bult in skin, and by that time, when i click on one of the available styles an error appears on the right side saying: An error occured while previewing
Error Code: 400
Error message:

and then when i choose the deploy tab, the following exception appears and closes the application:

Unhandeleded exception has occured in your application. If you click
Continue..................
The type initializer for 'az' threw an exception

Please help

note: i have the corporate license