[ovirt-users] oVirt4.2 snapshot upload fails

[David David]

Hi all.
oVirt 4.2

using this method
https://ovirt.org/develop/release-management/features/storage/backup-restore-disk-snapshots/
for backup and restore snapshots

trying to upload disk snapshot
thereis VM named vm-test, with disk id =
078398f5-0679-4eec-97e2-d227c097f453, storage = data00 and cluster =
testcluster.
i do snapshot of this VM.
and subsequently launched these scripts

download_vm_ovf.py
==================
if __name__ == "__main__":

    # Set VM name
    vm_name = 'vm-test'
====================

the ovf file is saved as 1d45f654-2ade-46c9-a747-2cd01ce14df2.ovf

download_disk_snapshots.py
==========================
if __name__ == "__main__":

    # Set relevant disk and stroage domain IDs
    disk_id = '078398f5-0679-4eec-97e2-d227c097f453'
    sd_name = 'data00'
==========================

the snapshot is saved as a8278905-57c9-4321-ab08-633436c5a63c

upload_disk_snapshots.py:
=========================
if __name__ == "__main__":

    # Set storage domain name
    sd_name = 'data00'

    # Set OVF file path
    ovf_file_path = '1d45f654-2ade-46c9-a747-2cd01ce14df2.ovf'

    # Disk to upload
    disk_path = 'a8278905-57c9-4321-ab08-633436c5a63c'
==================================

when trying run script upload_disk_snapshots.py, i got error with these message:

Traceback (most recent call last):
  File "snapshot_upload.py", line 279, in <module>
    images_chain = get_images_chain(disk_path)
  File "snapshot_upload.py", line 244, in get_images_chain
    base_volume = [v for v in volumes_info.values() if
'full-backing-filename' not in v ][0]
IndexError: list index out of range

Anyone can help with this?