bzr diff fails with traceback and error 'module' object has no attribute 'get_application_name'

I've just upgraded from bzr 1.15.1 to the following versions:

BZR_VERSION=bzr-1.17
BZR_GTK_VERSION=bzr-gtk-0.96.2
BZRTOOLS_VERSION=bzrtools-1.17.0
QBZR_VERSION=qbzr-0.12

 I ran bzr diff before and after and got the following error

bzr: ERROR: exceptions.AttributeError: 'module' object has no attribute 'get_application_name'

Traceback (most recent call last):
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/commands.py", line 835, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/commands.py", line 1030, in run_bzr
    ret = run(*run_argv)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/commands.py", line 647, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/commands.py", line 1045, in ignore_pipe
    result = func(*args, **kwargs)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/builtins.py", line 1908, in run
    apply_view=True)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/diff.py", line 333, in _get_trees_to_diff
    bzrdir.BzrDir.open_containing_tree_or_branch(old_url)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/bzrdir.py", line 965, in open_containing_tree_or_branch
    tree, branch = bzrdir._get_tree_branch()
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/bzrdir.py", line 934, in _get_tree_branch
    tree = self.open_workingtree()
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/bzrdir.py", line 1729, in open_workingtree
    return format.open(self, _found=True)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/workingtree.py", line 2983, in open
    wt = self._open(a_bzrdir, self._open_control_files(a_bzrdir))
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/workingtree_4.py", line 1451, in _open
    branch=a_bzrdir.open_branch(),
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/bzrdir.py", line 1712, in open_branch
    return format.open(self, _found=True, ignore_fallbacks=ignore_fallbacks)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/branch.py", line 1757, in open
    ignore_fallbacks=ignore_fallbacks)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/branch.py", line 2427, in __init__
    super(BzrBranch8, self).__init__(*args, **kwargs)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/branch.py", line 2073, in __init__
    Branch.__init__(self)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/branch.py", line 96, in __init__
    self._open_hook()
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/branch.py", line 2423, in _open_hook
    self._activate_fallback_location(url)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/branch.py", line 106, in _activate_fallback_location
    repo = self._get_fallback_repository(url)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/branch.py", line 211, in _get_fallback_repository
    possible_transports=[self.bzrdir.root_transport])
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/bzrdir.py", line 835, in open
    t = get_transport(base, possible_transports=possible_transports)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/transport/__init__.py", line 1587, in get_transport
    transport, last_err = _try_transport_factories(base, factory_list)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/transport/__init__.py", line 1610, in _try_transport_factories
    return factory.get_obj()(base), None
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/transport/remote.py", line 110, in __init__
    medium, credentials = self._build_medium()
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/transport/remote.py", line 516, in _build_medium
    user = auth.get_user('ssh', self._host, self._port)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/config.py", line 1156, in get_user
    path=path, realm=realm)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/config.py", line 1085, in get_credentials
    scheme, host, port, user, path, realm)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/config.py", line 1263, in get_fallback_credentials
    cs = self.get_credential_store(name)
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/config.py", line 1246, in get_credential_store
    cs = cs()
  File "/data/id/release/bzr/bzr_20090723/lib/python/bzrlib/plugins/gtk/keyring.py", line 34, in __init__
    if gobject.get_application_name() is None:
AttributeError: 'module' object has no attribute 'get_application_name'

bzr 1.17 on python 2.5.2 (linux2)
arguments: ['/data/id/release/bzr/current/bin/bzr', 'diff', '--using', 'meld', '-r', 'submit:']
encoding: 'ANSI_X3.4-1968', fsenc: 'ANSI_X3.4-1968', lang: None
plugins:
  bzrtools /data/id/release/bzr/current/lib/python/bzrlib/plugins/bzrtools [1.17]
  gtk /data/id/release/bzr/current/lib/python/bzrlib/plugins/gtk [0.96.2.final]
  launchpad /data/id/release/bzr/current/lib/python/bzrlib/plugins/launchpad [1.17]
  netrc_credential_store /data/id/release/bzr/current/lib/python/bzrlib/plugins/netrc_credential_store [1.17]
  qbzr /data/id/release/bzr/current/lib/python/bzrlib/plugins/qbzr [0.12]