Failure to restore. Failed with unkown error: KeyError: 1

I have Duplicity version 0.6.18. Python 2.7. I using Ubuntu 12.04 LTS, with this as the target filesystem.

The response I get when I try to restore is this:

Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1414, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1407, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1341, in main
    restore(col_stats)
  File "/usr/bin/duplicity", line 632, in restore
    restore_get_patched_rop_iter(col_stats)):
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 526, in Write_ROPaths
    for ropath in rop_iter:
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 498, in integrate_patch_iters
    for patch_seq in collated:
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 380, in yield_tuples
    setrorps( overflow, elems )
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 369, in setrorps
    elems[i] = iter_list[i].next()
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 113, in difftar2path_iter
    tarinfo_list = [tar_iter.next()]
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 330, in next
    self.set_tarfile()
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 324, in set_tarfile
    self.current_fp = self.fileobj_iter.next()
  File "/usr/bin/duplicity", line 668, in get_fileobj_iter
    backup_set.volume_name_dict[vol_num],
KeyError: 1

I would much appreciate it is someone could help me, I really need to get my files restored.