Backup Error

[Alejandro Da Lozzo]

I get the following message

Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1404, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1397, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1277, in main
    globals.archive_dir).set_values()
  File "/usr/lib/python2.7/dist-packages/duplicity/collections.py", line 691, in set_values
    self.get_backup_chains(partials + backend_filename_list)
  File "/usr/lib/python2.7/dist-packages/duplicity/collections.py", line 814, in get_backup_chains
    map(add_to_sets, filename_list)
  File "/usr/lib/python2.7/dist-packages/duplicity/collections.py", line 813, in add_to_sets
    log.Debug(_("Ignoring file (rejected by backup set) '%s'") % filename)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 2: ordinal not in range(128)

What is happening?