Failed to mount virtual hard disk

Backup- VRTSRV::\\Hyper-V01.ics-amman.edu.jo\Hyper-V?Virtual?Machine\Exchange Server 2010 Edge VM
V-79-57344-38726 - Backup Exec failed to connect to virtual machine 'Exchange Server 2010 Edge VM' and was unable to collect 
the necessary metadata to restore individual application items. You cannot perform GRT-enabled restores of application data 
from this backup.

V-79-57344-38721 - Failed to mount one or more virtual disk images:

 Error mounting disk(s): UNKNOWN_ERROR (0xe00084af).

V-79-57344-38721 - Echec du montage d'une ou de plusieurs images de disques virtuels : - Failed to mount one or more virtual disk images:

System : HYPER-V Windows 2008 R2 64bits and Cluster Shared Volume, BE2010

Here the tests that doesn't work : 

"Backup- VRTSRV::\\VICTOR.lablan.net\Hyper-V?Virtual?Machine\W2K8 USB RDX DELL
V-79-57344-38721 - Failed to mount one or more virtual disk images:

Error mounting disk(s): UNKNOWN_ERROR (0xe00084af)."

and contacted Symantec support.  They suggested I apply the patch listed below and amazingly it works!  Now I am able to backup my VM (both the complete VM and even the individual files) and even restore individual files to the VM.

64-bit

http://seer.entsupport.symantec.com/docs/355984.htm

32-bit

http://seer.entsupport.symantec.com/docs/355983.htm

Paul