bzr-svn aborted on 'bzr branch'

I tried to bzr branch a svn repo, and bzr aborted with this message and asking to file a report:

$ bzr branch $SVNROOT/gnome-games/trunk gnome-games-bzr
[==================================================================================== ] copying revision 3373/5192bzr: ERROR: libsvn._core.SubversionException: ("Can't create tunnel", 12)

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 626, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 588, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 292, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.4/site-packages/bzrlib/builtins.py", line 756, in run
    revision_id, basis_dir)
  File "/home/chpe/.bazaar/plugins/bzr-svn/format.py", line 80, in sprout
    result_repo = repo.clone(result, revision_id, basis)
  File "/usr/lib/python2.4/site-packages/bzrlib/decorators.py", line 38, in read_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.4/site-packages/bzrlib/repository.py", line 310, in clone
    self.copy_content_into(result, revision_id, basis)
  File "/usr/lib/python2.4/site-packages/bzrlib/repository.py", line 262, in copy_content_into
    return InterRepository.get(self, destination).copy_content(revision_id, basis)
  File "/usr/lib/python2.4/site-packages/bzrlib/decorators.py", line 51, in write_locked
    return unbound(self, *args, **kwargs)
  File "/home/chpe/.bazaar/plugins/bzr-svn/fetch.py", line 359, in copy_content
    self.source.transport.reparent(repos_root)
  File "/home/chpe/.bazaar/plugins/bzr-svn/transport.py", line 41, in locked
    return unbound(self, *args, **kwargs)
  File "/home/chpe/.bazaar/plugins/bzr-svn/transport.py", line 177, in reparent
    self.callbacks, svn_config, None)
  File "/usr/lib/python2.4/site-packages/libsvn/ra.py", line 322, in svn_ra_open2
    return apply(_ra.svn_ra_open2, args)
SubversionException: ("Can't create tunnel", 12)

bzr 0.13.0 on python 2.4.4.candidate.1 (linux2)
arguments: ['/usr/bin/bzr', 'branch', 'svn+ssh://<email address hidden>/svn/gnome-games/trunk', 'gnome-games-bzr']

** please send this report to <email address hidden>

This is feisty's bzr 0.13-0u1 running on edgy, with the latest bzr-svn version that supports bzr 0.13.