Djangoのサンプルで投稿内容が保存されない

Djangoで投稿保存ができない

フレームワークを使えるようにしておきたく以下urlでpythonのフレームワーク,Djangoを学んでいたところ
https://qiita.com/yoshizaki_kkgk/items/c9a5299b77b99ff07e4a
urlの終わりの方で投稿を保存したいのに、以下のようなエラーが出ます

発生している問題・エラーメッセージ

Request Method: POST
Request URL: http://127.0.0.1:8000/admin/blog/post/add/

Django Version: 1.8
Python Version: 3.7.2
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'blog')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware')


Traceback:
File "/home/username/anaconda3/lib/python3.7/site-packages/django/core/handlers/base.py" in get_response
  125.                     response = middleware_method(request, callback, callback_args, callback_kwargs)
File "/home/username/anaconda3/lib/python3.7/site-packages/django/middleware/csrf.py" in process_view
  174.                     request_csrf_token = request.POST.get('csrfmiddlewaretoken', '')
File "/home/username/anaconda3/lib/python3.7/site-packages/django/core/handlers/wsgi.py" in _get_post
  137.             self._load_post_and_files()
File "/home/username/anaconda3/lib/python3.7/site-packages/django/http/request.py" in _load_post_and_files
  260.                 self._post, self._files = self.parse_file_upload(self.META, data)
File "/home/username/anaconda3/lib/python3.7/site-packages/django/http/request.py" in parse_file_upload
  225.         return parser.parse()
File "/home/username/anaconda3/lib/python3.7/site-packages/django/http/multipartparser.py" in parse
  149.             for item_type, meta_data, field_stream in Parser(stream, self._boundary):
File "/home/username/anaconda3/lib/python3.7/site-packages/django/http/multipartparser.py" in __iter__
  628.             yield parse_boundary_stream(sub_stream, 1024)
File "/home/username/anaconda3/lib/python3.7/site-packages/django/http/multipartparser.py" in parse_boundary_stream
  567.     chunk = stream.read(max_header_size)
File "/home/username/anaconda3/lib/python3.7/site-packages/django/http/multipartparser.py" in read
  337.         out = b''.join(parts())

Exception Type: RuntimeError at /admin/blog/post/add/
Exception Value: generator raised StopIteration