The Entity Framework provider … could not be loaded

When you create a new Microsoft Visual Studio 2013 project that uses the Entity Framework you may get the following error message:
The Entity Framework provider type ‘System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer’ registered in the application config file for the ADO.NET provider with invariant name ‘System.Data.SqlClient’ could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.

• Add the EntityFramework NuGet package to the Data Access project that accesses the database and the Web Application or Web Service project that calls the project
  • Right click the project in Solution Explorer
  • Select Manage NuGet Packages…
  • On the left side select Online
  • On the right side enter EntityFramework into the search field
  • Click Install next to the EntityFramework package
• Make sure your app config file contains the following lines:

 

<entityFramework>
  <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
    <parameters>
      <parameter value="v11.0" />
    </parameters>
  </defaultConnectionFactory>
  <providers>
    <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
  </providers>
</entityFramework>

• Your project should contain a reference to EntityFramework.SqlServer.dll
• Add the following line to the constructor of the class that accesses the database

var type = typeof(System.Data.Entity.SqlServer.SqlProviderServices);

• Add the System.Data.Entity reference to the project accessing the database