ScheduledTasks st = new ScheduledTasks();
            Task task = st.OpenTask("test");
            if (task != null)
            {
                st.DeleteTask("test");
            }
            task = st.CreateTask("test");
            DateTime nextDate = DateTime.Now.AddMinutes(1);
            RunOnceTrigger rt = new RunOnceTrigger(nextDate);
            task.SetAccountInformation("user","pass");
            task.Triggers.Add(rt);
            task.ApplicationName = Assembly.GetExecutingAssembly().Location;
            task.Save();
            task.Close();
在  Save的时候 提示Additional information: 值不在预期的范围内,啥原因??