title: TypeError at /admin/ 'set' object is not reversible and argument( ) to reverse must be a sequence
body: <p>My app was working perfectly but when I tried the admin url, this error occurred.I can access every page of the website except for the admin page. 
  My project is <strong>mini</strong>
  <code>mini.urls.py</code></p>
  
  <pre><code>from django.conf.urls import url,include
  from django.contrib import admin
  
  urlpatterns = [
       url(r'^admin/', admin.site.urls),
       url(r'^', include('main.urls')),
       url(r'^', include('signup.urls',namespace='signup')),
  ]
  </code></pre>
  
  <p><code>main.urls.py</code></p>
  
  <pre><code> from django.conf.urls import url,include
   from . import views
  
   urlpatterns = [
        url(r'^$', views.index,name='index'),
   ]
  </code></pre>
  
  <p><code>signup.urls.py</code> </p>
  
  <pre><code> from django.conf.urls import url,include
   from . import views
  
   urlpatterns = {
      url(r'^signup/$', views.register, name='register'),
      url(r'^login/$', views.login_user, name='login'),
      url(r'^userpage/$', views.user_page, name='userpage'),
      url(r'^upload/$', views.upload_file, name='upload'),
      url(r'^logout/$', views.logout_user, name='logout'),
      url(r'^(?P&lt;uuid&gt;[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]
                                  {12})/$', views.doc_detail, name='detail'),
      url(r'^(?P&lt;uuid&gt;[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]
                                  {12})/decrypt/$', views.doc_decrypt, 
                                              name='docdecrypt'),
       }
  </code></pre>
  
  <p>The error I ran into at /admin/</p>
  
  <pre><code>     TypeError at /admin/
       'set' object is not reversible
       Request Method:    GET
       Request URL:   http://127.0.0.1:8000/admin/
       Django Version:    1.10.5
       Exception Type:    TypeError
       Exception Value:   
       'set' object is not reversible
       Exception Location:    
       C:\Users\user\AppData\Local\Programs\Python\Python36-32\lib\site-
       packages\django\urls\resolvers.py in _populate, line 196
       Python Executable: 
       C:\Users\user\AppData\Local\Programs\Python\Python36-32\python.exe
       Python Version:    3.6.0
       Python Path:   
       ['C:\\Users\\user\\Desktop\\django projects\\mini',
       'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-
       32\\python36.zip',
       'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-32\\DLLs',
       'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-32\\lib',
       'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-32',
       'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python36-
       32\\lib\\site-packages']
  </code></pre>
  
  <p>I tried running my webapp in another pc so I ran into the following error:</p>
  
  <pre><code>     TypeError at /admin/
       argument to reversed() must be a sequence
       Request Method:    GET
       Request URL:   http://127.0.0.1:8000/admin/
       Django Version:    1.10.5
       Exception Type:    TypeError
       Exception Value:   
       argument to reversed() must be a sequence
       Exception Location:    C:\Python27\lib\site-
       packages\django\urls\resolvers.py in _populate, line 196
       Python Executable: C:\Python27\python.exe
       Python Version:    2.7.12
       Python Path:   
       ['C:\\Users\\Admin\\Desktop\\mini',
       'C:\\Python27\\lib\\site-packages\\steganography-0.1.1-py2.7.egg',
       'C:\\Python27\\lib\\site-packages\\pillow-4.0.0-py2.7-win32.egg',
       'C:\\Python27\\lib\\site-packages\\olefile-0.44-py2.7.egg',
       'C:\\WINDOWS\\SYSTEM32\\python27.zip',
       'C:\\Python27\\DLLs',
       'C:\\Python27\\lib',
       'C:\\Python27\\lib\\plat-win',
       'C:\\Python27\\lib\\lib-tk',
       'C:\\Python27',
       'C:\\Python27\\lib\\site-packages']
  </code></pre>