horizon error message

Internal Server Error: /auth/login/
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 137, in get_response
    response = response.render()
  File "/usr/lib/python2.7/dist-packages/django/template/response.py", line 105, in render
    self.content = self.rendered_content
  File "/usr/lib/python2.7/dist-packages/django/template/response.py", line 82, in rendered_content
    content = template.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 140, in render
    return self._render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 134, in _render
    return self.nodelist.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 840, in render
    bit = self.render_node(node, context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 854, in render_node
    return node.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/loader_tags.py", line 123, in render
    return compiled_parent._render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 134, in _render
    return self.nodelist.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 840, in render
    bit = self.render_node(node, context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 854, in render_node
    return node.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 840, in render
    bit = self.render_node(node, context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 854, in render_node
    return node.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/loader_tags.py", line 155, in render
    return self.render_template(self.template, context)
  File "/usr/lib/python2.7/dist-packages/django/template/loader_tags.py", line 137, in render_template
    output = template.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 140, in render
    return self._render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 134, in _render
    return self.nodelist.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 840, in render
    bit = self.render_node(node, context)
  File "/usr/lib/python2.7/dist-packages/django/template/base.py", line 854, in render_node
    return node.render(context)
  File "/usr/lib/python2.7/dist-packages/django/template/defaulttags.py", line 433, in render
    url = reverse(view_name, args=args, kwargs=kwargs, current_app=context.current_app)
  File "/usr/lib/python2.7/dist-packages/django/core/urlresolvers.py", line 536, in reverse
    return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
  File "/usr/lib/python2.7/dist-packages/django/core/urlresolvers.py", line 403, in _reverse_with_prefix
    self._populate()
  File "/usr/lib/python2.7/dist-packages/django/core/urlresolvers.py", line 267, in _populate
    for pattern in reversed(self.url_patterns):
  File "/usr/lib/python2.7/dist-packages/django/core/urlresolvers.py", line 367, in url_patterns
    iter(patterns)
  File "/usr/lib/python2.7/dist-packages/horizon/base.py", line 564, in __iter__
    self._setup()
  File "/usr/lib/python2.7/dist-packages/django/utils/functional.py", line 298, in _setup
    self._wrapped = self._setupfunc()
  File "/usr/lib/python2.7/dist-packages/horizon/base.py", line 733, in url_patterns
    return self._urls()[0]
  File "/usr/lib/python2.7/dist-packages/horizon/base.py", line 767, in _urls
    url(r'^%s/' % dash.slug, include(dash._decorated_urls)))
  File "/usr/lib/python2.7/dist-packages/horizon/base.py", line 464, in _decorated_urls
    url(r'^%s/' % url_slug, include(panel._decorated_urls)))
  File "/usr/lib/python2.7/dist-packages/horizon/base.py", line 234, in _decorated_urls
    urlpatterns = self._get_default_urlpatterns()
  File "/usr/lib/python2.7/dist-packages/horizon/base.py", line 87, in _get_default_urlpatterns
    urls_mod = import_module('.urls', package_string)
  File "/usr/lib/python2.7/dist-packages/django/utils/importlib.py", line 40, in import_module
    __import__(name)
  File "/usr/lib/python2.7/dist-packages/contrail_openstack_dashboard/openstack_dashboard/dashboards/admin/l3routers/urls.py", line 18, in <module>
    from contrail_openstack_dashboard.openstack_dashboard.dashboards.admin.l3routers import views
  File "/usr/lib/python2.7/dist-packages/contrail_openstack_dashboard/openstack_dashboard/dashboards/admin/l3routers/views.py", line 24, in <module>
    from contrail_openstack_dashboard.openstack_dashboard.dashboards.admin.networking import views as n_views
  File "/usr/lib/python2.7/dist-packages/contrail_openstack_dashboard/openstack_dashboard/dashboards/admin/networking/views.py", line 26, in <module>
    from contrail_openstack_dashboard.openstack_dashboard.dashboards.project.networking \
  File "/usr/lib/python2.7/dist-packages/contrail_openstack_dashboard/openstack_dashboard/dashboards/project/networking/views.py", line 41, in <module>
    from contrail_openstack_dashboard.openstack_dashboard.dashboards.project.networking \
  File "/usr/lib/python2.7/dist-packages/contrail_openstack_dashboard/openstack_dashboard/dashboards/project/networking/workflows.py", line 86, in <module>
    class CreateSubnetInfoAction(workflows.Action):
  File "/usr/lib/python2.7/dist-packages/contrail_openstack_dashboard/openstack_dashboard/dashboards/project/networking/workflows.py", line 98, in CreateSubnetInfoAction
    cidr = fields.IPField(label=_("Network Address"),
AttributeError: 'module' object has no attribute 'IPField'