Example command ends with fatal error: UnicodeDecodeError: 'ascii' codec can't decode

[ChieftainY2k]

I've just tried to run an example from the http://duplicity.nongnu.org/duplicity.1.html page, and that's what I got:

# duplicity --include /home --include /etc --exclude ’**’ / file:///usr/local/backup
Traceback (most recent call last):
  File "/usr/local/bin/duplicity", line 1525, in <module>
    with_tempdir(main)
  File "/usr/local/bin/duplicity", line 1519, in with_tempdir
    fn()
  File "/usr/local/bin/duplicity", line 1357, in main
    action = commandline.ProcessCommandLine(sys.argv[1:])
  File "/usr/local/lib/python2.7/dist-packages/duplicity/commandline.py", line 1117, in ProcessCommandLine
    set_selection()
  File "/usr/local/lib/python2.7/dist-packages/duplicity/commandline.py", line 957, in set_selection
    sel.ParseArgs(select_opts, select_files)
  File "/usr/local/lib/python2.7/dist-packages/duplicity/selection.py", line 285, in ParseArgs
    self.parse_catch_error(e)
  File "/usr/local/lib/python2.7/dist-packages/duplicity/selection.py", line 300, in parse_catch_error
    (exc, util.ufn(self.prefix)), log.ErrorCode.file_prefix_error)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 0: ordinal not in range(128)

My setup is:
# python -V
Python 2.7.3
# uname -a
Linux 4.1.6+ #810 PREEMPT Tue Aug 18 15:19:58 BST 2015 armv6l GNU/Linux
# duplicity -V
duplicity 0.7.05

What am I doing wrong ?