snapcenter 4.1 nfs backup vmware, NON-Supported entity

Hi to all

for a customer demo, i prepared an snapcenter environment with netapp simulator and a nested ESX .And installed snapcenter , registered the vsphere plugin for virtual center.

the test vms running on NFS datastore, and  i can create a resourse group for this datastore and can take backups and can restore the vms in this datastore

But when it comes to backup invidiual vms backup with different resource group, i can create the needed resource group but when i run the backup, it gives the following error

"Activity 'Discovering Resources' failed with error: The Resource Group contains a non-supported entity type for the backup.

"ı couldnot find any clue how to solve this,also on the netapp filer ,the following event generated"app.log.err: SNAPCENT: SnapCenter Software 4.1.1.2827: (1002) Error: Job [114] Activity [Discovering Resources] failed with error: The Resource Group contains a non-supported entity type for the backup."Any ideas???