model_query does not support boolean read_deleted values

Unrecognized read_deleted value 'True'
  File "/usr/lib/python2.6/dist-packages/nova/compute/manager.py", line 174, in decorated_function
    return function(self, context, instance_uuid, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/nova/compute/manager.py", line 1557, in get_lock
    instance_ref = self.db.instance_get_by_uuid(context, instance_uuid)
  File "/usr/lib/python2.6/dist-packages/nova/db/api.py", line 586, in instance_get_by_uuid
    return IMPL.instance_get_by_uuid(context, uuid)
  File "/usr/lib/python2.6/dist-packages/nova/db/sqlalchemy/api.py", line 119, in wrapper
    return f(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/nova/db/sqlalchemy/api.py", line 1446, in instance_get_by_uuid
    result = _build_instance_get(context, session=session).\
  File "/usr/lib/python2.6/dist-packages/nova/db/sqlalchemy/api.py", line 119, in wrapper
    return f(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/nova/db/sqlalchemy/api.py", line 1473, in _build_instance_get
    project_only=True).\
  File "/usr/lib/python2.6/dist-packages/nova/db/sqlalchemy/api.py", line 188, in model_query
    _("Unrecognized read_deleted value '%s'") % read_deleted)