ERROR    Unknown failure
Traceback (most recent call last):
  File "/usr/sbin/virt-install", line 895, in ?
    main()
  File "/usr/sbin/virt-install", line 677, in main
    options.sparse, options.nodisks, guest, ishvm, conn)
  File "/usr/sbin/virt-install", line 239, in get_disks
    is_file_path), disk, size)
  File "/usr/sbin/virt-install", line 239, in <lambda>
    is_file_path), disk, size)
  File "/usr/sbin/virt-install", line 202, in get_disk
    d = cli.disk_prompt(None, kwargs)
  File "/usr/lib/python2.4/site-packages/virtinst/cli.py", line 277, in disk_prompt
    if dev.is_conflict_disk(conn) is True:
  File "/usr/lib/python2.4/site-packages/virtinst/VirtualDisk.py", line 890, in is_conflict_disk
    xml = vm.XMLDesc(0)
  File "/usr/lib64/python2.4/site-packages/libvirt.py", line 247, in XMLDesc
    if ret is None: raise libvirtError ('virDomainGetXMLDesc() failed', dom=self)
libvirtError: Unknown failure