Implementing Repository Pattern With Entity Framework

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I am attempting to create a Repository/Specification pattern on my Entity Framework data model based on your example. However, I get an error when attempting to add the records. The error states The EntitySet name 'XXX' could not be found. It has the correct name, but cannot find it. It generates the error when the Add is reached:

ProductManger testProduct = new ProductManger();
List<Product> newProductList = new List<Product>
Console.WriteLine("Adding New Product.......");

For (int i = 1; i <= 5; i++)
{
string productName = "Product Name";
Product prod = AddDefaultProduct(productName)
newProductList.Add(prod);
}

Which calls...

public void Add(E entity)
{
    _ctx.AddObject(entity.GetType().Name, entity);
}

If I comment this out the program runs, I can write this list out to the screen, but cannot add it to the database.

Please advise as to how to correct the error that is being generated.