EF 4.1 exception “The provider did not return a ProviderManifestToken string”

Question

I am trying to replicate an example found on MSDN. I am using ASP.NET and EF 4.1 (CTP?). I\'ve used NuGet to install the EntityFramework package.

I am getting this e

Answer 1

This error is only present while the .edmx file is open and disappears as soon as the file is closed again.

This quote from CodePlex , this worked with me (visual studio 2013 /MVC 5)