Hyper-V - Unable to list VMs

Hello Guys,

I'm getting this error when I try to select the VMs in a policy of a specific node in a Hyper-V Cluster:

13:18:02.886 [8576.7864] <2> Map<VMVirtualServerInfo>: VMServer name = [SRVXXXX-2K8](VTconvertor.cpp:163)
13:18:02.886 [8576.7864] <2> TAO: (8576|7864)VMServer type = [4]
13:18:02.886 [8576.7864] <2> Map<VMVirtualServerInfo>: VMServer errorString = [Unable to list VM's](VTconvertor.cpp:188)
13:18:02.886 [8576.7864] <2> TAO: [8576|7864]No. of items in this sequence = [0]
13:18:02.886 [8576.7864] <2> TAO: [8576|7864]No. of items in this sequence = [0]

This policy was working and when the schedule run I getting the error code 48 for all VMs of SRVXXXX-2K8

21/04/2012 18:52:28 - end Flash Backup Windows, Read File List; elapsed time: 00:00:00

21/04/2012 18:52:28 - begin Flash Backup Windows, Create Snapshot

21/04/2012 18:52:29 - started process bpbrm (2380)

21/04/2012 18:53:26 - Error bpbrm(pid=2380) Nameuse [0], VM [XYZ-2k8.xpto.com.br] not found on any node. Is either powered off or does not exist.

21/04/2012 18:53:26 - end writing

Status 48

21/04/2012 18:53:26 - end Flash Backup Windows, Create Snapshot; elapsed time: 00:00:58

21/04/2012 18:53:26 - begin Flash Backup Windows, Stop On Error

Status 0