How many times I encounter the error No module named 'blog.views' how else to fix it?

Question

Django

Please help solve this problem!
all the necessary code below
an error occurs and xs how to solve it, everything seems to be imported everywhere
No module named 'blog.views'
this urls is in the root of the project

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

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

this url is in the app

from django.conf.urls import url

from blog.views import PostsListView, PostDetailView

urlpatterns = [
  url(r'^$', PostsListView.as_view(), name='list'), 												
  url(r'^(?<pk>\d+)/$', PostDetailView.as_view()), 
                                  
]

this is a view

from blog.models import Post
from django.views.generic import ListView, DetailView

class PostListView (ListView): 
  model = Post 				

class PostDetailView (DetailView): 
  model = Post

this is a model

from django.db import models

class Post(models.Model):
  title = models.CharField(max_length = 225)
  datetime = models.DateTimeField(u'Дата публикации')
  content = models.TextField(max_length = 10000)

  def __unicide__(self):
    return self.title

  def get_absolute_url(self):
    return "/blog/{0}i/" .format(self.id)

Answer 1

Is there an empty __init__.py file in the views directory?

Answer 2

blog is in INSTALLED_APPS ?