Cannot restore backup copy

[Edgar Ramón Herrera Morgado]

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 1289, in main
    globals.archive_dir).set_values()
  File "/usr/lib/python2.7/dist-packages/duplicity/collections.py", line 693, in set_values
    self.get_backup_chains(partials + backend_filename_list)
  File "/usr/lib/python2.7/dist-packages/duplicity/collections.py", line 816, in get_backup_chains
    map(add_to_sets, filename_list)
  File "/usr/lib/python2.7/dist-packages/duplicity/collections.py", line 806, in add_to_sets
    if set.add_filename(filename):
  File "/usr/lib/python2.7/dist-packages/duplicity/collections.py", line 97, in add_filename
    (self.volume_name_dict, filename)
AssertionError: ({ All files --- Todos los archivos})