Result code 0x57 when scheduling a backup

This was a slightly odd one that did not show up on Google at all. We had a bunch of backup jobs on our main Windows 2003 file server and had recently promoted the Win2003 server to a domain controller using DCPROMO.EXE. In the process of doing that, some tasks refused to run and we also had to delete and re-add a lot of tasks.

In the Scheduled Tasks window, we saw a result code of "0x57" in the Last Result column. In the schedule log (Scheduled Tasks, Advanced, View Log):

"Backup-FileServer-DailyAppend-Week2.job" (ntbackup.exe)
Finished 7/28/2006 8:30:48 PM
Result: The task completed with an exit code of (57).

We checked a few things and finally took a very close look at the "Run" field in the task. Turns out that we were missing a double-quote in the middle of the NTBACKUP command line.