Veritas scheduled Differential Backups failing: Event ID 58057

I have an urgent issue with Veritas.  I am a network administrator and there are about 500 employees in my organization.  It is imperative that I back up their information.  I am running Veritas on a Windows 2003 virtual server (our database server) with Hyper-V on Windows 2008 R2 Datacenter Edition.  The backups are copied from our file server and other servers to a network access storage device, a Thecus NAS.  

The differential backups have been failing to perform since Tuesday, September 7.  When I open up Veritas in the device manager is says that the folder is offline, I try to put it back online and nothing happens.  I did not rename, delete, or unshare the folder.  I have also gone through the steps here: http://seer.entsupport.symantec.com/docs/252415.htm and verified everything.  Flushing the DNS did not resolve it either.  Today in the job monitor it says the differential backup is paused in current jobs but that it’s active, and if I go to the Veritas device tab, it says the differential backup folder is offline.  

I also checked event viewer of the database server, and another error I saw was (Event ID 33808):

An error occurred while processing a B2D command.
Changer: CreateChangerConfig() Unable to Create Changer.cfg

Please help.
DepecheServerAsked:
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DepecheServerConnect With a Mentor Author Commented:
i figured this one out.  i just deleted the B2D folders and recreated them.
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Rodney BarnhardtServer AdministratorCommented:
So, you are saying you can run a full backup with no problem?
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DepecheServerAuthor Commented:
Yes, the full backup has been working fine.  However, my last full backup was Sunday starting at 11:59 AM and ending in the wee hours of Monday at 1:30 AM.  The differential backup started failing on Tuesday, so I don't know if the full backup will work next week, however, the full backup to disk folder is online, the differential backup to disk folder shows its offline.  So I am assuming the full backup will work.
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DepecheServerAuthor Commented:
I just verified it today.  The full backup is running as usual and it worked.  The differential backups continue to fail.  
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DepecheServerAuthor Commented:
This is a simple solution and it worked.
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