VADP backup failed in networker 8.0.3 due to "Cannot mount the required number of volumes"

Hi All,

We are now using networker 8.0.3 and client is windows 2003 sp2 and we are facing the below issue while taking VADP backup and getting failed.

Could we have any solution for that, please tell me?

Suppressed 1644 bytes of output.
VADP VM-TMP Directory Location: c:\mnt\server\server\server-tmp\letters\1.
Temporary Directory for VM created.
VADP TMP Directory Location: c:\mnt\server\server\tmp.
Temporary Directory for VADP created.
Temporary vmMntLoc Directory for VADP created.
Performing the backup via the Virtual Center.
Trying to connect to the VM using ipaddr/DNS name 'server_name'.
Performing a FULL Image level backup.
Creating a quiesced snapshot for 'server_name'.
Creating snapshot for 'vm-7503' ...
Task is -1% complete
Task is -1% complete
The snapshot was created successfully for VM 'server'.
Downloading VM configuration for server.
Configuration downloaded successfully for VM 'server'.

Following are the details of the client server_name:
VirtualCenter  : x.x.x.x  IP

ESX Server  : server.latam.americas.gcn.local
DataCenter Name  : MIAMI DC
ConfigDatastore Name : VM_OS_PG-R
Resourcepool Name : /

Following is the disk information of the client server_name:
Disk 1 Label  : Hard disk 2
Disk 1 Size  : 136.7 GB
Disk 1 Datastore name : VM_DA-R2
Disk 2 Label  : Hard disk 1
Disk 2 Size  : 136.0 GB
Disk 2 Datastore name : VM_OS_PG-R
Total Number of Disks : 2

Obtained the virtual disks for the VM.
Change block tracking is disabled for VM: server_name

File level Recovery from Image level backup is enabled.
MORef for the VM is obtained.
Obtained the virtual disks for the VM.
Using 'nbd' as the transport mode for Hard disk 2.
Using 'nbd' as the transport mode for Hard disk 1.
Starting mountvm operation.
Successfully mounted the VM as a file system.
Cannot mount the required number of volumes. Exiting.
The VADP proxy and the VM client are possible clones of each other or derived from the same parent. Please try by setting the transport mode as nbd.
Cleaningup VADP mount operation.
Deleting snapshot for 'snapshot-8652' ...
Task is -1% complete
Task is -1% complete
Snapshot for VM server is deleted.
Temporary directory 'c:\mnt\server_name' for VADP deleted.
server_name:*FULL*: No full backups of this save set were found in the media database; performing a full backup
server_name:*FULL*: retried 1 times.