Error when pushing 0.4.8 to a branch that exists in svn.

sabrina dreid:~/projects/Twisted-bzr/branches/twisted-8.0.x-3085> bzr push
Using saved location: svn+ssh://svn.twistedmatrix.com/svn/Twisted/branches/twisted-8.0.x-3085
bzr: ERROR: exceptions.ValueError: need more than 0 values to unpack

Traceback (most recent call last):
  File "/Library/Python/2.5/site-packages/bzrlib/commands.py", line 834, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/Library/Python/2.5/site-packages/bzrlib/commands.py", line 790, in run_bzr
    ret = run(*run_argv)
  File "/Library/Python/2.5/site-packages/bzrlib/commands.py", line 492, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/Library/Python/2.5/site-packages/bzrlib/builtins.py", line 825, in run
    push_result = br_from.push(br_to, overwrite)
  File "/Library/Python/2.5/site-packages/bzrlib/decorators.py", line 127, in read_locked
    return unbound(self, *args, **kwargs)
  File "/Library/Python/2.5/site-packages/bzrlib/branch.py", line 1569, in push
    _override_hook_source_branch=_override_hook_source_branch)
  File "/Library/Python/2.5/site-packages/bzrlib/branch.py", line 1611, in _push_with_bound_branches
    result = self._basic_push(target, overwrite, stop_revision)
  File "/Library/Python/2.5/site-packages/bzrlib/branch.py", line 1630, in _basic_push
    target.update_revisions(self, stop_revision)
  File "/Users/dreid/.bazaar/plugins/svn/branch.py", line 364, in update_revisions
    push(self, other, revid)
  File "/Users/dreid/.bazaar/plugins/svn/commit.py", line 701, in push
    builder.commit(rev.message)
  File "/Users/dreid/.bazaar/plugins/svn/commit.py", line 461, in commit
    done, None, False)
  File "/Users/dreid/.bazaar/plugins/svn/errors.py", line 114, in convert
    raise convert_error(e)
  File "/Users/dreid/.bazaar/plugins/svn/errors.py", line 84, in convert_error
    (msg, num) = err.args
ValueError: need more than 0 values to unpack

bzr 1.2.0 on python 2.5.1.final.0 (darwin)
arguments: ['/usr/local/bin/bzr', 'push']
encoding: 'UTF-8', fsenc: 'utf-8', lang: 'en_US.UTF-8'
plugins:
  bzrtools /Library/Python/2.5/site-packages/bzrlib/plugins/bzrtools [1.2.0]
  launchpad /Library/Python/2.5/site-packages/bzrlib/plugins/launchpad [unknown]
  multiparent /Library/Python/2.5/site-packages/bzrlib/plugins/multiparent.py [unknown]
  svn /Users/dreid/.bazaar/plugins/svn [0.4.8]
*** 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.
zsh: exit 4 DYLD_LIBRARY_PATH=/Users/dreid/.bazaar/svn/lib PYTHONPATH= bzr push