No Entity Framework provider found

<connectionStrings>
 <add name="ComicContextDb" connectionString="Data Source=|DataDirectory|\Database1.sdf" providerName="System.Data.SqlServerCe.4.0"/>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
<providers>
  <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
controller.cs

        private ComicContext database = new ComicContext("ComicContextDb");
    [HttpPost]
    public ActionResult RSVPForm(GuestResponse from)
    {
        database.Database1.Add(from);
        database.SaveChanges();
        return Content("New comic added.");
    }