我不知道为什么Django无法在我的应用程序中找到请求的URL。

这是我得到的错误代码：

 Using the URLconf defined in littlelogsms.urls, Django tried these URL patterns, in this order:
^admin/
^$
The current URL, success/, didn't match any of these.

这是我的 sms.urls.py 文件：

from django.conf.urls import url

from sms import views

urlpatterns = [
    url(r'^success/$', views.success, name='success'),
    url(r'^$', views.index, name='index')
]

这是应用程序的 urls.py 文件：

from django.conf.urls import include, url
from django.contrib import admin


urlpatterns = [
    url(r'^admin/', include(admin.site.urls)),
    url(r'^$', include('sms.urls')),
]

我找不到我犯的错误。有任何想法吗？