ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded

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 https://go.microsoft.com/fwlink/?LinkId=260882 for more information.The Entity Framework provider type 'System.Data