Не могу добавить UserControl на форму - ссылка на объект не указывает на экземпляр

config.AсtorConnectionString = stringSettings["Aсtor"].ToString();

public QueryAnalyser()
        {
            InitializeComponent();
            
            //////Config
            var appSettings = ConfigurationManager.AppSettings;
            config = new Config();
            config.OracleConnectionString = appSettings["OraConnString"];
            ConnectionStringSettingsCollection stringSettings = ConfigurationManager.ConnectionStrings;
            config.TransportConnectionString = stringSettings["Transport"].ToString();
            config.ActorConnectionString = stringSettings["Actor"].ToString();
            /////Connection
            connTr = new SqlConnection(config.TransportConnectionString);
            connTr.Open();
            /////Queries
*****
        }

public static Config config;

public static Config config;
        public static SqlConnection connTr;
        public static ServiceClient serviceClient;
        public static string serviceAddr = ConfigurationManager.AppSettings["ServiceAddr"];
        [STAThread]
        static void Main()
        {
            System.Configuration.ConnectionStringSettingsCollection stringSettings = ConfigurationManager.ConnectionStrings;
            var appSettings = ConfigurationManager.AppSettings;
            config = new Config
            {
                OracleConnectionString = appSettings["OraConnString"],
                OracleUserName = appSettings["OraName"],
                OraclePassword = appSettings["OraPwd"]
            };
            config.TransportConnectionString = stringSettings["Transport"].ToString();
            config.ActorConnectionString = stringSettings["Actor"].ToString();
            connTr = new SqlConnection(config.TransportConnectionString);
            connTr.Open();

public static class GearBox
    {
        private static WSHttpBinding binding;
        private static EndpointAddress endpoint;
        public static string LastCard { get; private set; }
        static GearBox()
        {
            binding = new WSHttpBinding();
            binding.OpenTimeout = new TimeSpan(2, 10, 0);
            binding.CloseTimeout = new TimeSpan(2, 10, 0);
            binding.SendTimeout = new TimeSpan(2, 10, 0);
            binding.ReceiveTimeout = new TimeSpan(2, 10, 0);
            binding.Security.Mode = SecurityMode.None;
            string svcAddr = ConfigurationManager.AppSettings["SvcAddr"];
 
            Uri uri = new Uri("http://" + svcAddr + "/Svc");
            endpoint = new EndpointAddress(uri);
            GetLastCard();
         }
         public static string GetLastCard()
        {
            return LastCard = new ServiceClient(binding, endpoint).getLastCardNumber();
        }
}

private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                lastCardNumberLabel.Text = GearBox.LastCard;
            }
            catch (Exception ex)
            {
                richTextBox1.Text += ex.Message;
            }
        }

Uri uri = new Uri("http://" + svcAddr + "/Svc");