LinqPad and EntityTypeConfiguration

LINQPad version - 5.41.00
EF - 6.1.3

I have several projects in the solution. One contains the entities, and another contains the configuration files that define table names, key fields, property types, lengths, etc.

I am using DbContext and have included the configuration project dll, but get the following messages:

ModelValidationException: One or more validation errors were detected during model generation:

CodeFirstNamespace.ContractDocument: : EntityType 'ContractDocument' has no key defined. Define the key for this EntityType.

Is there a way to get LINQPad to recognize the configurations?

Thanks

I am using the Fluent API for property mapping.

Here is an example:

//==============
// Region.cs
//==============
namespace MyProject.Entities
{
using System.ComponentModel.DataAnnotations;

public class Region
{
    public int RegionId { get; set; }

    [Required(ErrorMessage = "Region Name is required")]
    [StringLength(100, ErrorMessage = "Region can not be more than 100 characters")]
    public string RegionName { get; set; }
}

}

//=====================
// RegionConfiguration.cs
//=====================
namespace MyProject.Data.Configuration
{
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity.ModelConfiguration;
using Entities;

public class RegionConfiguration: EntityTypeConfiguration<Region>
{
    public RegionConfiguration()
    {
        ToTable("Region");
        HasKey(x => x.RegionId);
        Property(x => x.RegionId).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
    }
}

}