One or more virtual disks contain volumes that do not support Granular Recovery Technology (GRT)

Hi

I am currently trying to use Backup Exec 2012 SP3 to backup a virtual machine with Windows Server 2012 on a VM server. We backup the Virtual machine VMDK fine but we cannot do a GRT restore. We have the windows agent installed and the permissions look fine but we still get the following error every time. V-79-57344-38725 - One or more virtual disks contain volumes that do not support Granular Recovery Technology (GRT). Granular restores cannot be performed for these volumes.

We have several other Virtual machines that run on the same vm server and these work fine but these are Server 2003/2008

Any help would be greatly appreciated