UnicodeEncodeError in isdir

I am trying to run bzr dedicated server for getting a branch on Solaris 10 and I got the following error:

solaris10-x86$ bzr branch bzr+ssh://192.168.2.104/home/adi/project/server/devel
adi@192.168.2.104's password:
bzr: ERROR: exceptions.UnicodeEncodeError: 'ascii' codec can't encode character u'\u021b' in position 90: ordinal not in range(128)

Traceback (most recent call last):
  File "/opt/csw/lib/python/site-packages/bzrlib/commands.py", line 923, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/opt/csw/lib/python/site-packages/bzrlib/commands.py", line 1128, in run_bzr
    ret = run(*run_argv)
  File "/opt/csw/lib/python/site-packages/bzrlib/commands.py", line 676, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/opt/csw/lib/python/site-packages/bzrlib/commands.py", line 698, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/opt/csw/lib/python/site-packages/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/opt/csw/lib/python/site-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/opt/csw/lib/python/site-packages/bzrlib/builtins.py", line 1314, in run
    source_branch=br_from)
  File "/opt/csw/lib/python/site-packages/bzrlib/bzrdir.py", line 454, in sprout
    create_tree_if_local=create_tree_if_local)
  File "/opt/csw/lib/python/site-packages/bzrlib/cleanup.py", line 131, in run
    self.cleanups, self.func, self, *args, **kwargs)
  File "/opt/csw/lib/python/site-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/opt/csw/lib/python/site-packages/bzrlib/bzrdir.py", line 513, in _sprout
    hardlink=hardlink, from_branch=result_branch)
  File "/opt/csw/lib/python/site-packages/bzrlib/bzrdir.py", line 1175, in create_workingtree
    accelerator_tree=accelerator_tree, hardlink=hardlink)
  File "/opt/csw/lib/python/site-packages/bzrlib/workingtree_4.py", line 1550, in initialize
    delta_from_tree=delta_from_tree)
  File "/opt/csw/lib/python/site-packages/bzrlib/transform.py", line 2532, in build_tree
    delta_from_tree)
  File "/opt/csw/lib/python/site-packages/bzrlib/transform.py", line 2650, in _build_tree
    tt.finalize()
  File "/opt/csw/lib/python/site-packages/bzrlib/transform.py", line 1217, in finalize
    delete_any(path)
  File "/opt/csw/lib/python/site-packages/bzrlib/osutils.py", line 1070, in delete_any
    _delete_file_or_dir(path)
  File "/opt/csw/lib/python/site-packages/bzrlib/osutils.py", line 1089, in _delete_file_or_dir
    if isdir(path): # Takes care of symlinks
  File "/opt/csw/lib/python/site-packages/bzrlib/osutils.py", line 532, in isdir
    return stat.S_ISDIR(os.lstat(f)[stat.ST_MODE])
UnicodeEncodeError: 'ascii' codec can't encode character u'\u021b' in position 90: ordinal not in range(128)

bzr 2.5b2 on python 2.6.6 (Solaris-2.10-i86pc-i386-32bit-ELF)
arguments: ['/opt/csw/bin/bzr', 'branch',
    'bzr+ssh://192.168.2.104/home/adi/project/server/devel']
plugins: bash_completion[2.5b2], changelog_merge[2.5b2], launchpad[2.5b2],
    netrc_credential_store[2.5b2], news_merge[2.5b2], weave_fmt[2.5b2]
encoding: '646', fsenc: '646', lang: None