UnicodeEncodeError on unrepresentable filename in cmd_ls.run

I use Bazaar with redmine, and when i try to open subfolder, i have an error.
The Traceback

bzr: ERROR: exceptions.UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 73: ordinal not in range(128)

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 835, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 1030, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 647, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 1045, in ignore_pipe
    result = func(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 2526, in run
    self.outf.write(outstring + '\n')
  File "/usr/lib/python2.5/codecs.py", line 303, in write
    data, consumed = self.encode(object, self.errors)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 73: ordinal not in range(128)

bzr 1.17 on python 2.5.3 (linux2)
arguments: ['/usr/bin/bzr', 'ls', '-v', '--show-ids', 'http://www.jbtheou.fr/bzr/mpsi-math/Mathematique']
encoding: 'ANSI_X3.4-1968', fsenc: 'ANSI_X3.4-1968', lang: 'C'
plugins:
  bzrtools /usr/lib/python2.5/site-packages/bzrlib/plugins/bzrtools [1.17]
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [1.17]
  netrc_credential_store /usr/lib/python2.5/site-packages/bzrlib/plugins/netrc_credential_store [1.17]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.