Entity Framework Migrations Error : Sequence contains no elements - Timestamp

I created a project in Visual Studio 2015 using the code Code First for entity framework 6.

I'm testing migrations.

command: Add-Migration Initial
error: Sequence contains no matching element

I've been experimenting a lot, and I think I've identified the problem.

[Timestamp]
public byte[] RowVersion { get; set; }

First is an example model-code.

using MySql.Data.Entity;
using System.Data.Common;
using System.Data.Entity;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace TokoBersama.Model
{
    // Code-Based Configuration and Dependency resolution
    [DbConfigurationType(typeof(MySqlEFConfiguration))]
    public class MySqlDatabaseConnection : DbContext
    {


        #region Tabels

        public DbSet<returnpenjualan> ReturnPenjualan { get; set; }         

        #endregion

        #region member Event
        public MySqlDatabaseConnection()
            : base("name=myConnectionString")
        {

        }

        public MySqlDatabaseConnection(DbConnection existingConnection, bool contextOwnsConnection)
      : base(existingConnection, contextOwnsConnection)
        {

        }

        //protected override void OnModelCreating(DbModelBuilder modelBuilder)
        //{
        //    base.OnModelCreating(modelBuilder);
        //
        //    Map entity to table
        //    modelBuilder.Entity<jenis>().MapToStoredProcedures();
        //}

        #endregion

    }

    #region tabels

    public class returnpenjualan
    {
        [Key]
        [StringLength(12)]
        public string frjb { get; set; }

        [Required]
        [StringLength(12)]
        public string fjb { get; set; }

        //THE CAUSE OF ERROR
        [Timestamp]
        public byte[] RowVersion { get; set; }

        [Required]
        [StringLength(15)]
        public string kepada { get; set; }

        [Required]
        [StringLength(45)]
        public string alamat { get; set; }


        [StringLength(45)]
        public string ktp { get; set; }

        [Required]
        public double jumlahreturnpenjualan { get; set; }

        [Required]
        [StringLength(45)]
        public string username { get; set; }
    }

    #endregion

}

ASK
I've looked up tutorials and the like for utilising "Timestamp" in DataAnnotation, but I always get the same response. Am I missing something?