The item with identity 'Id' already exists in the metadata collection. Parameter name: item

My entities share the following basic class:

public class Entity<TKey> : IEntity<TKey>
{
    dynamic IEntity.Id
    {
        get
        {
            return this.Id;
        }
        set
        {
            this.Id = value;
        }
    }

    public TKey Id { get; set; }
}

Examples of Status entities

[MetadataType(typeof(StatusMetadata))]
public partial class Status : Entity<byte>
{
       public string Title { get; set; }
}

I see the following error when I run the database query: "The metadata collection already has the item with identification "Id." the parameter item ". Is there a method to fix this, or is there a problem with inheritance that prevents me from deriving my entities from any class?