无法找到请求的.Net Framework数据提供程序。程序（SqlClient）

I am trying to set up a simple ASP.NET MVC 4 webapp using DB first migrations from a SQL Server (2005). I have created the tables in the database and used Entity Framework to create the objects in the code. I can access the data using these objects.I am trying to set up a simple ASP.NET MVC 4 we