ServiceStack OrmLite exception

Item.sql

CREATE TABLE [dbo].[Item](
	[Id] [int] IDENTITY(1,1) NOT NULL,
	[Data] [nvarchar](max) NOT NULL,
	[CreatedAt] [datetime] NOT NULL,
 CONSTRAINT [PK_item_1] PRIMARY KEY CLUSTERED 
(
	[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON)
)

ItemData.cs

using System;
using ServiceStack.DataAnnotations;

[Alias("Item")]
public class ItemData
{
	[AutoIncrement]
	public int Id { get; set; }

	public string Data { get; set; }

	public DateTime CreatedAt { get; set; }
}

PlayerEquipment.cs

public class PlayerEquipment
{
	[AutoIncrement]
	public string Id { get; set; }

	public int PlayerId { get; set; }

	[References(typeof(ItemData))]
	public int ItemId { get; set; }

	public int Quantity { get; set; }

	public bool IsEquipped { get; set; }

	[Reference]
	public ItemData ItemData { get; set; }
}

PlayerEquipment.sql

CREATE TABLE [dbo].[PlayerEquipment](
	[Id] [int] IDENTITY(1,1) NOT NULL,
	[PlayerId] [int] NOT NULL,
	[ItemId] [int] NOT NULL,
	[Quantity] [smallint] NOT NULL,
	[IsEquipped] [bit] NOT NULL,
 CONSTRAINT [PK_PlayerEquipment] PRIMARY KEY CLUSTERED 
(
	[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON)
)

PlayerRepository.cs

using System;
using System.Data;
using ServiceStack.Data;
using ServiceStack.OrmLite;

public class PlayerRepository : IDisposable
{
  private IDbConnectionFactory dbFactory;

  private IDbConnection db;
  protected IDbConnection Db
  {
    get { return this.db ?? (this.db = this.dbFactory.Open()); }
  }
  
  public PlayerRepository(IDbConnectionFactory dbFactory)
  {
    this.dbFactory = dbFactory;
  }

  List<PlayerEquipment GetEquipment(int playerId)
  {
    return this.Db.LoadSelect<PlayerEquipment>(q => q.PlayerId == playerId); // <-- MethodMissingException
  }
  
  public void Dispose()
  {
    if(this.db != null)
    {
      this.db.Dispose();
    }
  }
}