System.NotImplementedException произошло в Ecng.Serialization.dll

securityComboBox.ItemsSource = WorkWithDB.Storage.Securities;

//класс для работы с базой данных
    static class WorkWithDB
    {
        public static string connectionString { get; set; }
        public static string name { get; set; }
        static Database db;
        public static StorageRegistry Storage;
        public static SettingsStorage SettingStorage;

        public static bool IsInit=false;

        public static string BasePath = "datastorage";

        public static void Init()
        {
            name = "trading_db";

            SqlConnectionStringBuilder con_builder = new SqlConnectionStringBuilder();

            con_builder.DataSource = @"1-ПК\MSSQL2008";
            con_builder.InitialCatalog = "Trading";
            con_builder.UserID = "trading";
            con_builder.Password = "trading";
            connectionString = con_builder.ConnectionString;

            db = new Database(name, connectionString);
            Storage = new StorageRegistry(db) ;
            Storage.BasePath = BasePath; 
            SettingStorage = new SettingsStorage();
            
            IsInit=true;

        }

    }