[ovirt-users] delete snapshot error

Hi all, I am using ovirt4.1. I failed deleting a snapshot of a vm. The state of the snapshot stayed locked and I could not start the vm. Anyone can help? Thanks! PS: some logs: VDSM command ReconcileVolumeChainVDS failed: Could not acquire resource. Probably resource factory threw an exception.: () VDSM host command GetVGInfoVDS failed: Volume Group does not exist: (u'vg_uuid: nL3wgg-uctH-1lGd-Vyl1-f1P2-fk95-tH5tlj',)