bzr.dev requires read lock

Olive does not run with current bzr.dev

$ ./olive-gtk
No handlers could be found for logger "bzr"
Traceback (most recent call last):
  File "./olive-gtk", line 89, in ?
    app = OliveGtk()
  File "/home/rahlf/Code/bazaar/bzr-gtk/olive/__init__.py", line 186, in __init__
    self._load_right()
  File "/home/rahlf/Code/bazaar/bzr-gtk/olive/__init__.py", line 656, in _load_right
    for rpath, file_class, kind, id, entry in self.wt.list_files():
  File "/usr/local/stow/bazaar-dev/lib/python2.4/site-packages/bzrlib/workingtree.py", line 1032, in list_files
    raise errors.ObjectNotLocked(self)
bzrlib.errors.ObjectNotLocked: <WorkingTree3 of /home/rahlf/Code/bazaar/bzr-gtk> is not locked

Olive: development branch, http://bazaar.launchpad.net/~phanatic/bzr-gtk/integration/)
Bazaar: development branch, http://bazaar-vcs.org/bzr/bzr.dev/