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

I have multiple projects in a solution and added EF to each project in different times. On some machines it was working and on some it failed with aforementioned error. It took me a while to notice that some of my project's app.config had this:

This is ok if you use LocalDb (new "sql express" like), but completely wrong if you don't have that specific server installed and use a regular SQL.

Solution: Remove the above code.