System.Data.SQLite

I have this tables in my sqlite database:

public partial class Videos
    {
        public Videos()
        {
            this.Series = new HashSet<Series>();
            this.VideosPersonas = new HashSet<VideosPersonas>();
            this.VideosVersiones = new HashSet<VideosVersiones>();
            this.Generos = new HashSet<Generos>();
        }

        public long IDVideo { get; set; }
        public string Titulo { get; set; }
        public string Version { get; set; }
        public Nullable<short> Duracion { get; set; }
        public Nullable<short> Anyo { get; set; }
        public bool Favorito { get; set; }
        public bool Pendiente { get; set; }
        public string Descripcion { get; set; }
        public Nullable<long> IDPortada { get; set; }
        public long IDTipo { get; set; }

        public virtual Ficheros Ficheros { get; set; }
        public virtual ICollection<Series> Series { get; set; }
        public virtual Tipos Tipos { get; set; }
        public virtual ICollection<VideosPersonas> VideosPersonas { get; set; }
        public virtual ICollection<VideosVersiones> VideosVersiones { get; set; }
        public virtual ICollection<Generos> Generos { get; set; }
    }



public partial class VideosVersiones
    {
        public long IDVersion { get; set; }
        public long IDVideo { get; set; }
        public long IDEpisodio { get; set; }

        public virtual Episodios Episodios { get; set; }
        public virtual Versiones Versiones { get; set; }
        public virtual Videos Videos { get; set; }
    }



public partial class Series
    {
        public Series()
        {
            this.Episodios = new HashSet<Episodios>();
        }

        public long IDSerie { get; set; }
        public long IDVideo { get; set; }
        public Nullable<short> AnyoInicio { get; set; }
        public Nullable<short> AnyoFin { get; set; }
        public Nullable<short> NumeroTemporadas { get; set; }

        public virtual ICollection<Episodios> Episodios { get; set; }
        public virtual Videos Videos { get; set; }
    }



public partial class Episodios
    {
        public Episodios()
        {
            this.VideosVersiones = new HashSet<VideosVersiones>();
        }

        public long IDEpisodio { get; set; }
        public long IDSerie { get; set; }
        public byte Temporada { get; set; }
        public byte Episodio { get; set; }
        public string Titulo { get; set; }
        public Nullable<byte> Anyo { get; set; }

        public virtual Series Series { get; set; }
        public virtual ICollection<VideosVersiones> VideosVersiones { get; set; }
    }


I want to get the Videos, and its related VideosVersiones, so I am trying to use eager loading.

using (catalogoEntities miContexto = new catalogoEntities())
{
     lstResultado = miContexto.Videos
                            .Include(v=>v.VideosVersiones)
                            .Include(v => v.Generos).ToList<Videos>();
}


I get this error:

   en System.Data.EntityKey.AddHashValue(Int32 hashCode, Object keyValue)
   en System.Data.EntityKey.GetHashCode()
   en System.Collections.Generic.GenericEqualityComparer`1.GetHashCode(T obj)
   en System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
   en System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)
   en System.Data.Objects.ObjectStateManager.TryGetEntityEntry(EntityKey key, EntityEntry& entry)
   en System.Data.Common.Internal.Materialization.Shaper.HandleEntityAppendOnly[TEntity](Func`2 constructEntityDelegate, EntityKey entityKey, EntitySet entitySet)
   en lambda_method(Closure , Shaper )
   en System.Data.Common.Internal.Materialization.Coordinator`1.ReadNextElement(Shaper shaper)
   en System.Data.Common.Internal.Materialization.Shaper`1.RowNestedResultEnumerator.MoveNext()
   en System.Data.Common.Internal.Materialization.Shaper`1.ObjectQueryNestedEnumerator.TryReadToNextElement()
   en System.Data.Common.Internal.Materialization.Shaper`1.ObjectQueryNestedEnumerator.ReadElement()
   en System.Data.Common.Internal.Materialization.Shaper`1.ObjectQueryNestedEnumerator.MoveNext()
   en System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   en System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   en Catalogo.Models.RepositorySQLite3.buscarVideos(ParamVideos paramVideo) en C:\proyectos\Catalogo\Catalogo\Models\RepositorySQLite3.cs:línea 168


Is something related with the collection VideosVersiones in the entity Videos, that it seems that is null. But I don't know occurs this, because I can do eager loading of all others related entities.

Solved. It was my badm bacause I can't use null in a field that is part of a multi field primary key.