Closed Unassigned: Getting operation failed when trying to update [11315]

The task scheduler keeps returning
the operation failed. Please copy the information below and provide it to your system administrator
but there is no information below to submit to the system administrator.

It fails at this line in the code

TaskFolder.RegisterTaskDefinition("Scheduled_Task", DownloadTaskDefinition, TaskCreation.Update, <Username>, <password>, TaskLogonType.Password)

There is no errors to troubleshoot except that operation failure. Even when I debug it just stops and my web page shows that.

Any and all help is appreciated.
Comments: Closing with no affirmative response from reporter.