Job Failed - The job failed with the following error: A failure occurred accessing the SnapShot Handle

I am getting this error on several of my backups.  It is as follows:

"[serverbackupjobname] -- The job failed with the following error: A failure occurred accessing the SnapShot handle."

 I am not using the ADvanced Open File Option .  The same agent was installed on all of my servers at the same time.  This is Backup Exec 2012 Version 14.0 Rev. 1798 (64-bit) SP2

Thanks again my friends

Cathy