WPF Application fails on startup with TypeInitializationException

Question

I have a simple WPF application which I am trying to start. I am following the Microsoft Patterns and Practices \"Composite Application Guidance for WPF\". I\'ve followed

Answer 1

Tracking the InnerExceptions deep down , you might find the following error:

"Only one element allowed per config file and if present must be the first child of the root element"

This order change happened after Visual Studio EntityFramework Wizard added the connectionStrings element to the top