EF 4.1 Code First error - The entity type SomeType is not part of the model for the current context

Question

While working with EF code first I get error given below at different times:

The entity type SomeType is not part of the model for the current context.

Answer 1

UPDATE

This error kept attacking me with various updates I made to the database. Eventually I deleted the edmx file and just created it again with the same tables and stored procs.

Old

I got this when the generated entity was missing a nullable column:

//------------------------------------------------------------------------------
// 
//    This code was generated from a template.
//
//    Manual changes to this file may cause unexpected behavior in your application.
//    Manual changes to this file will be overwritten if the code is regenerated.
// 
//------------------------------------------------------------------------------

namespace MyProgram.Models
{
    using System;
    using System.Collections.Generic;

    public partial class Question
    {
        public int id { get; set; }
        public string title { get; set; }
        public string body { get; set; }
        public string tags { get; set; }
        public int votes { get; set; }//I had to manually add this property which is nullable int in the database
    }
}

I added the property after generating the initial model. However, I even tried deleting the table and recreating it. That didn't fix it. Only adding the property manually fixed it for me.