SQLite - retrieving data using LINQ

I am stuck with this problem since few evenings. I have SQLite database in my application. I have created that SQLite DB from a file. The ERD diagram is shown below:

And now in my application I create a connection to my database:

using (var conn = new SQLiteConnection(DB_PATH))
{
    // retrieving statemets...
}

I have created classes which represent tables in my DB:

public class Kantory
    {
        public Kantory()
        {
            this.kursy = new HashSet<Kursy>();
        }

        [SQLite.PrimaryKey, SQLite.AutoIncrement]
        public int id_kantory { get; set; }
        public string nazwa { get; set; }

        public virtual ICollection<Kursy> kursy { get; set; }
    }

public class Waluty
    {
        public Waluty()
        {
            this.kursy = new HashSet<Kursy>();
        }

        [SQLite.PrimaryKey, SQLite.AutoIncrement]
        public int id_waluty { get; set; }
        public string nazwa { get; set; }

        public virtual ICollection<Kursy> kursy { get; set; }
    }

public class Kursy
    {
        [SQLite.PrimaryKey, SQLite.AutoIncrement]
        public int id_kursy { get; set; }
        public int id_kantory { get; set; }
        public int id_waluty { get; set; }
        public decimal kurs { get; set; }
        public System.DateTime data { get; set; }
        public int aktualne { get; set; }

        public virtual Kantory kantory { get; set; }
        public virtual Waluty waluty { get; set; }
    }

As you can see, in kursy table I have two foreign keys - id_kantory and id_waluty.

And now very curious and strange thing happens. When I try to retrieve some information using normal SQL statemets it work fine!:

using (var conn = new SQLiteConnection(DB_PATH))
{
    var query = new SQLiteCommand(conn);
    query.CommandText = "SELECT * FROM Kursy INNER JOIN Kantory ON Kursy.id_kursy=Kantory.id_kantory WHERE Kantory.id_kantory = 1";
    var result = query.ExecuteQuery<Kursy>();
}

This code works fine! BUT when I try to use my classes using LINQ like this:

using (var conn = new SQLiteConnection(DB_PATH))
{
    var result = conn.Table<Kursy>().Where(k => k.kantory.id_kantory == 1).FirstOrDefault();
}

It throws me a NotSupportedException! The messsage is: Member access failed to compile expression

BUT when I use my classes using LINQ WITHOUT JOINING another class it works!:

using (var conn = new SQLiteConnection(DB_PATH))
    {
        var result = conn.Table<Kursy>().Where(k => k.id_kursy == 1).FirstOrDefault();
    }

So in the end: my problem is that I cannot join more that one table using LINQ query. Seems that this model in classes is wrong but I really don't know why.

PS. This is Windows Phone 8.1 Application, so I cannot use Entity Framework for that.