Windows 2003 Server Task Scheduler Exit Code (1)

I have a cmd file that is executed every morning at 2:59:59 in Windows 2003 Server Task Scheduler. It runs, taking about 20 minutes to complete its tasks. If I run it manually from the command line, it runs without error. The automated run in Task Scheduler, however, finishes with an Exit Code of (1).

The task list is fairly simple: I delete all files in about 12 folders on three network drives, and copy about 500 files from a production system into those same folders. The idea is to get the production system backed up to three network locations, so we always have yesterday's data available.

I've entered my own Active Directory credentials in the scheduler to ''backup as'' myself (admin), and following deletion, am using the UNC convention to copy out the files, following this format:

COPY CPU982ADMINADMINNEWACCTGPAYROLL*.ASC BHAM-ENG-DATASHAREGLOBALJJANSKYRBaseSandboxPAYROLL /V /Y

Here is the result with the error code:
''Backup RBase.job'' (BackupRBase.cmd)
Started 3/4/2009 3:00:00 AM
''Backup RBase.job'' (BackupRBase.cmd)
Finished 3/4/2009 3:20:23 AM
Result: The task completed with an exit code of (1).

You can see, it took 20 minutes and 23 seconds to run, so it IS doing something, but the error code concerns me. I'm finding little help in a google search.