Unable to run swift with devstack: LookupError: Entry point 'middleware' not found in egg 'swift3'

The latest code of devstack and swift has given me the following error, when I enable swift in enabled_services.

=========================Log of swift=====================================
Traceback (most recent call last):
  File "/opt/stack/swift/bin/swift-proxy-server", line 22, in <module>
    run_wsgi(conf_file, 'proxy-server', default_port=8080, **options)
  File "/opt/stack/swift/swift/common/wsgi.py", line 133, in run_wsgi
    loadapp('config:%s' % conf_file, global_conf={'log_name': log_name})
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
    return loadobj(APP, uri, name=name, **kw)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 271, in loadobj
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 320, in _loadconfig
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 450, in get_context
    global_additions=global_additions)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 562, in _pipeline_app_context
    for name in pipeline[:-1]]
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 454, in get_context
    section)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 476, in _context_from_use
    object_type, name=use, global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 406, in get_context
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 328, in _loadegg
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 620, in get_context
    object_type, name=name)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 659, in find_egg_entry_point
    for prot in protocol_options] or '(no entry points)'))))
LookupError: Entry point 'middleware' not found in egg 'swift3' (dir: /opt/stack/swift3; protocols: paste.filter_factory, paste.filter_app_factory; entry_points: )