Internal error when selecting branch configuration

[Gilles]

bzr: ERROR: exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xe9 in position 23: ordinal not in range(128)

Traceback (most recent call last):
  File "C:/prg/dev/Bazaar/plugins\explorer\lib\explorer.py", line 1947, in do_set_branch_configuration
  File "C:/prg/dev/Bazaar/plugins\explorer\lib\explorer.py", line 1232, in edit_config_file
  File "C:/prg/dev/Bazaar/plugins\explorer\lib\explorer.py", line 1272, in edit_file
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe9 in position 23: ordinal not in range(128)

bzr 2.4.2 on python 2.6.6 (win32)
arguments: ['C:\\prg\\dev\\Bazaar\\bzrw.exe', 'explorer']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\prg\dev\Bazaar\plugins\bzrtools [2.4.1]
  changelog_merge C:\prg\dev\Bazaar\plugins\changelog_merge [2.4.2]
  colo C:\prg\dev\Bazaar\plugins\colo [0.3.1dev]
  explorer C:\prg\dev\Bazaar\plugins\explorer [1.2.1]
  fastimport C:\prg\dev\Bazaar\plugins\fastimport [0.12.0dev]
  launchpad C:\prg\dev\Bazaar\plugins\launchpad [2.4.2]
  loom C:\prg\dev\Bazaar\plugins\loom [2.2.1dev]
  netrc_credential_store C:\prg\dev\Bazaar\plugins\netrc_credential_store [2.4.2]
  news_merge C:\prg\dev\Bazaar\plugins\news_merge [2.4.2]
  pipeline C:\prg\dev\Bazaar\plugins\pipeline [1.1.0]
  qbzr C:\prg\dev\Bazaar\plugins\qbzr [0.21.1]
  rewrite C:\prg\dev\Bazaar\plugins\rewrite [0.6.3dev]
  svn C:\prg\dev\Bazaar\plugins\svn [1.1.0]
  upload C:\prg\dev\Bazaar\plugins\upload [1.0.1dev]
  xmloutput C:\prg\dev\Bazaar\plugins\xmloutput [0.8.7]

[Martin Packman (gz)]

In bzr-explorer 1.2.1 the explorer.py line 1272, in edit_file is:

    msg = gettext("Failed to edit '%(path)s' using '%(editor)s'.") % \
            {'path': path, 'editor': editor}
    info = gettext(
        "You may want to install the matching application or change the configured editor.")
> details = unicode(ex)
    self.show_error(gettext("Sorry"), msg, info, details)

So, this a knock-on failure trying to format an error report including localised messages from the OS, see the existing bug report for more. To resolve the root cause, check your editor setting.