New Post: Exception when modifying task with Editor UI

When I change the task with the Editor UI, after entering my username and password, I get a Exception not handled error message.

Stack trace:
System.ArgumentException: (27,8):UserId:
en
Microsoft.Win32.TaskScheduler.V2Interop.ITaskFolder.RegisterTaskDefinition(S
tring Path, ITaskDefinition pDefinition, Int32 flags, Object UserId, Object password, TaskLogonType LogonType, Object sddl)
en Microsoft.Win32.TaskScheduler.TaskFolder.RegisterTaskDefinition(String
Path, TaskDefinition definition, TaskCreation createType, String UserId, String password, TaskLogonType LogonType, String sddl)
en Microsoft.Win32.TaskScheduler.TaskEditDialog.okBtn_Click(Object
sender, EventArgs e)
en System.Windows.Forms.Control.OnClick(EventArgs e)
en System.Windows.Forms.Button.OnClick(EventArgs e)
en System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
en System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
en System.Windows.Forms.Control.WndProc(Message& m)
en System.Windows.Forms.ButtonBase.WndProc(Message& m)
en System.Windows.Forms.Button.WndProc(Message& m)
en System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)