Crash when attempting to set branching scheme

Repository URL is private...

$ bzr svn-branching-scheme --set svn://svn.example.com/
/usr/lib/python2.5/site-packages/bzrlib/plugins/email/__init__.py:57: DeprecationWarning: bzrlib.branch.BranchHooks.install_hook was deprecated in version 1.5.
  Branch.hooks.install_hook('post_commit', branch_commit_hook)
bzr: ERROR: exceptions.NameError: global name 'set_config_scheme' is not defined

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 841, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 797, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 499, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/rbrown/.bazaar/plugins/svn/__init__.py", line 398, in run
    set_config_scheme(repos, scheme, mandatory=True)
NameError: global name 'set_config_scheme' is not defined

bzr 1.5rc1 on python 2.5.2 (linux2)
arguments: ['/usr/bin/bzr', 'svn-branching-scheme', '--set', 'svn://svn.example.com/']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  bookmarks /home/rbrown/.bazaar/plugins/bookmarks [unknown]
  bzrtools /usr/lib/python2.5/site-packages/bzrlib/plugins/bzrtools [1.4.0]
  diffstat /home/rbrown/.bazaar/plugins/diffstat [unknown]
  email /usr/lib/python2.5/site-packages/bzrlib/plugins/email [unknown]
  extmerge /home/rbrown/.bazaar/plugins/extmerge [unknown]
  gtk /usr/lib/python2.5/site-packages/bzrlib/plugins/gtk [0.93.0]
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [unknown]
  loom /home/rbrown/.bazaar/plugins/loom [1.3.0]
  plugin_managment /home/rbrown/.bazaar/plugins/plugin_managment [unknown]
  pqm /usr/lib/python2.5/site-packages/bzrlib/plugins/pqm [1.0.0dev0]
  rebase /usr/lib/python2.5/site-packages/bzrlib/plugins/rebase [0.3.0]
  svn /home/rbrown/.bazaar/plugins/svn [0.4.11dev0]
*** 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.