[Fixed]-'str' object has no attribute 'resolve' when access admin site

According to excellent answer posted here:
http://redsymbol.net/articles/django-attributeerror-str-object-no-attribute-resolve/

There are generally several sources of this error:

1. You missed ‘pattern keyword’:

   urlpatterns = ('',
   (r'^$', direct_to_template, {'template' : 'a.html'}),
   # ...
   

   this should be changed to:

   urlpatterns = patterns('',
   (r'^$', direct_to_template, {'template' : 'a.html'}),
   # ...
   

   Note that in Django 1.8+, it’s better to use a list of regexes instead of patterns.

   urlpatterns = [
       (r'^$', direct_to_template, {'template' : 'a.html'}),
       ...
   ]
   

2. You missed a comma in some tuple, like:

   (r'^hello/$' 'views.whatever') 
   

3. You commented out some url()s using triple-quotes

4. You carelessly leave a closing bracket in the wrong place:

   (r'^(?P\d{4})/$', 'archive_year', entry_info_dict), 'coltrane_entry_archive_year',
   

   instead of:

   (r'^(?P\d{4})/$', 'archive_year', entry_info_dict, 'coltrane_entry_archive_year'),
   

5. You set ROOT_URLCONF to be a list

6. When migrating from the pattern tuples to a regular list you forgot to remove the empty '' argument of the pattern.

Please check carefully if you don’t have one of this cases in your code.

For me, this caused the problem:

urlpatterns = patterns('',
    url(r'^all/$', 'album.views.albums'),
    """
    url(r'^create/$', 'album.views.create'),
    url(r'^get/(?P<album_id>\d+)/$', 'album.views.album'),
    url(r'^like/(?P<album_id>\d+)/$', 'album.views.like_album'),
"""
)

and this solved it:

urlpatterns = patterns('',
    url(r'^all/$', 'album.views.albums'),
)
"""
    url(r'^create/$', 'album.views.create'),
    url(r'^get/(?P<album_id>\d+)/$', 'album.views.album'),
    url(r'^like/(?P<album_id>\d+)/$', 'album.views.like_album'),
"""

I saw this possibility in a comment on http://redsymbol.net/articles/django-attributeerror-str-object-no-attribute-resolve/