> I just started working on a game as a hobby project, and when I execute
> this query:

>  if(gameCollection.Any(g => g.NumPlayers <
> GameConstants.MAX_PLAYERS_PER_GAME))
>             {
>                 return gameCollection.First(g => g.NumPlayers <
> GameConstants.MAX_PLAYERS_PER_GAME);
>             }

> I get the error "
> *Class MOMGame.GameObjects.Map cannot be assigned to Class
> MOMGame.GameObjects.Game.  Ensure that known types are derived from the
> mapped class.
> Parameter name: type*"

> Any idea what I'm doing wrong? The 2 classes are pretty simple, and listed
> below.

> Game:

> [BsonKnownTypes(typeof(MOMGame.GameObjects.Map),
> typeof(MOMGame.GameObjects.Location), typeof(MOMGame.GameObjects.Game),
> typeof(MOMGame.GameObjects.UserInfo))]
>     public class Game
>     {
>         [BsonId]
>         public Guid Id { get; set; }
>         public  Map Map { get; set; }

>         public string Name { get; set; }

>         public List<Guid> Players { get; set; }
>         [BsonRepresentation(BsonType.Int32)]
>         public int NumPlayers { get; set; }
>         public Game()
>         {
>             Players = new List<Guid>();
>             //if (!BsonClassMap.IsClassMapRegistered(typeof(Game)))
>             //{
>             //    BsonClassMap.RegisterClassMap<Game>(cm => cm.AutoMap());
>             //}
>         }

>         public static void SaveGame(Game game)
>         {
>             var connectionString = "mongodb://localhost/?safe=true";
>             var server = MongoServer.Create(connectionString);
>             var database = server.GetDatabase("mom");
>             var gameCollection = database.GetCollection<Game>("games");
>             game.NumPlayers = game.Players.Count;
>             gameCollection.Save(game);
>         }

>         public static Game GetNextGame()
>         {
>             var connectionString = "mongodb://localhost/?safe=true";
>             var server = MongoServer.Create(connectionString);
>             var database = server.GetDatabase("mom");
>             var gameCollection =
> database.GetCollection<Game>("games").AsQueryable();
>             if(gameCollection.Any(g => g.NumPlayers <
> GameConstants.MAX_PLAYERS_PER_GAME))
>             {
>                 return gameCollection.First(g => g.NumPlayers <
> GameConstants.MAX_PLAYERS_PER_GAME);
>             }
>             else
>             {
>                 return GameCreator.CreateGame();
>             }
>         }
>     }

> Map:

> [BsonKnownTypes(typeof(MOMGame.GameObjects.Map),
> typeof(MOMGame.GameObjects.Location) , typeof(MOMGame.GameObjects.Game),
>  typeof(MOMGame.GameObjects.UserInfo))]
>     public class Map
>     {
>         public Map()
>         {
>             //if (!BsonClassMap.IsClassMapRegistered(typeof(Map)))
>             //{
>             //    BsonClassMap.RegisterClassMap<Map>(cm => cm.AutoMap());
>             //}
>         }
>         [BsonIgnore]
>         public ILocation[][] Grid { get; set; }

>         [BsonId]
>         public Guid Id { get; set; }

>         public string Name { get; set; }
>         [BsonIgnore]
>         public List<ILocation> Locations
>         {
>             get
>             {

>                 List<ILocation> locs = new List<ILocation>();
>                 for (int i = 0; i < Grid.Length; i++)
>                 {
>                     for (int j = 0; j < Grid[i].Length; j++)
>                     {
>                         locs.Add(Grid[i][j]);
>                     }
>                 }
>                 return locs;

>             }
>         }
>     }

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