Django "TemplateDoesNotExist at /blog/ 에러 발생

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'bookmark.apps.BookmarkConfig',
    'blog.apps.BlogConfig',

urlpatterns = [
    url(r'^admin/', include(admin.site.urls)),
    url(r'^bookmark/', include('bookmark.urls', namespace='bookmark')),
    url(r'^blog/', include('blog.urls', namespace='blog')),
]

from __future__ import unicode_literals
 
from django.apps import AppConfig
 
 
class BlogConfig(AppConfig):
    name = 'blog'

from django.views.generic import ListView, DetailView
from django.views.generic.dates import ArchiveIndexView, YearArchiveView, MonthArchiveView
from django.views.generic.dates import DayArchiveView, TodayArchiveView
 
from blog.models import Post
# Create your views here.
 
#-- ListView
class PostLV(ListView) :
    model = Post
    template_name = '/blog/post_all.html'
    context_object_name = 'posts'
    paginate_by = 2
 
#-- DetailView
class PostDV(DetailView) :
    model = Post
 
#-- ArchiveView
class PostAV(ArchiveIndexView) :
    model = Post
    date_field = 'modify_date'
 
class PostYAV(YearArchiveView) :
    model = Post
    date_field = 'modify_date'
    make_object_list = True
 
class PostMAV(MonthArchiveView) :
    model = Post
    date_field = 'modify_date'
 
class PostDAV(DayArchiveView) :
    model = Post
    date_field = 'modify_date'
 
class PostTAV(TodayArchiveView) :
    model = Post
    date_field = 'modify_date'

from django.conf.urls import url
from blog.views import *
 
urlpatterns = [
 
    url(r'^$', PostLV.as_view(), name='index'),
 
    url(r'^posts/$', PostLV.as_view(), name='post_list'),
 
    url(r'^post/(?P<slug>[-\w]+)/$', PostDV.as_view(), name='post_detail'),
 
    url(r'^archive/$', PostAV.as_view(), name='post_archive'),
 
    url(r'^(?P<year>\d{4})/$', PostYAV.as_view(), name='post_year_archive'),
 
    url(r'^(P<year>\d{4})/(?P<month>[a-z]{3})/$', PostMAV.as_view(), name='post_month_archive'),
 
    url(r'^(?P<year>\d{4})/(?P<month>[a-z]{3})/(?P<day>\d{1,2})/$', PostDAV.as_view(), name='post_day_archive'),
 
    url(r'^today/$', PostTAV.as_view(), name='post_today_archive'),
]