trying to check out drizzle

$ bzr branch lp:drizzle
bzr: ERROR: exceptions.AttributeError: addinfourl instance has no attribute 'getheader'

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/commands.py", line 911, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/commands.py", line 1111, in run_bzr
    ret = run(*run_argv)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/commands.py", line 689, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/commands.py", line 704, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/builtins.py", line 1209, in run
    from_location)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/bzrdir.py", line 1032, in open_tree_or_branch
    bzrdir = klass.open(location)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/bzrdir.py", line 910, in open
    t = get_transport(base, possible_transports=possible_transports)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/lazy_import.py", line 125, in __call__
    return obj(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/transport/__init__.py", line 1569, in get_transport
    base = directories.dereference(base)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/directory_service.py", line 58, in dereference
    return service().look_up(name, url)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/plugins/launchpad/lp_directory.py", line 59, in look_up
    return self._resolve(url)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/plugins/launchpad/lp_directory.py", line 69, in _resolve
    result = resolve.submit(service)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/plugins/launchpad/lp_registration.py", line 272, in submit
    self._authenticated)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/plugins/launchpad/lp_registration.py", line 195, in send_request
    result = method(*method_params)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xmlrpclib.py", line 1224, in __call__
    return self.__send(self.__name, args)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xmlrpclib.py", line 1570, in __request
    verbose=self.__verbose
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/plugins/launchpad/lp_registration.py", line 78, in request
    return self.parse_response(response)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xmlrpclib.py", line 1449, in parse_response
    if response.getheader("Content-Encoding", "") == "gzip":
AttributeError: addinfourl instance has no attribute 'getheader'

bzr 2.2.0 on python 2.7.0 (Darwin-10.4.0-i386-64bit)
arguments: ['/Library/Frameworks/Python.framework/Versions/2.7/bin/bzr', 'branch', 'lp:drizzle']
encoding: 'UTF-8', fsenc: 'utf-8', lang: 'en_US.UTF-8'
plugins:
  bash_completion /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/plugins/bash_completion [2.2.0]
  launchpad /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/plugins/launchpad [2.2.0]
  netrc_credential_store /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/plugins/netrc_credential_store [2.2.0]
  news_merge /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bzrlib/plugins/news_merge [2.2.0]

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.