Exception on Connect

GTFROTA.cs

static void Main(string[] args)
  {
    try{
        GTFrotaIntegracaoClient client = new GTFrotaIntegracaoClient();
        if (client.Autenticar("JSANTANA", "123"))
          Console.WriteLine("Acesso autorizado");
        else
          Console.WriteLine("ACesso negado");
        }catch(Exception ex){
          Console.WriteLine(ex.Message);
        }
        finally
        {
          Console.ReadKey();
      }
  }