full_error_trace_newsletter_embed

ValueError at /testnewsletter
The view stylesite.views.EmbedNewsletterSubscribeView didn't return an HttpResponse object. It returned None instead.
Request Method:	GET
Request URL:	http://127.0.0.1:8000/testnewsletter
Django Version:	2.0.2
Exception Type:	ValueError
Exception Value:	
The view stylesite.views.EmbedNewsletterSubscribeView didn't return an HttpResponse object. It returned None instead.
Exception Location:	/Users/barbaradonnini/Documents/stylevenv/lib/python3.6/site-packages/django/core/handlers/base.py in _get_response, line 139
Python Executable:	/Users/barbaradonnini/Documents/stylevenv/bin/python
Python Version:	3.6.2
Python Path:	
['/Users/barbaradonnini/Google Drive/Boxplot/boxplot-style-test',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload',
 '/Users/barbaradonnini/Documents/stylevenv/lib/python3.6/site-packages',
 '/Users/barbaradonnini/Documents/stylevenv/src/django-newsletter',
 '/Users/barbaradonnini/Google Drive/Boxplot/boxplot-style-test/stylesite']
Server time:	Sat, 24 Mar 2018 11:54:38 -0400
Traceback Switch to copy-and-paste view
/Users/barbaradonnini/Documents/stylevenv/lib/python3.6/site-packages/django/core/handlers/exception.py in inner
            response = get_response(request) ...
▶ Local vars
/Users/barbaradonnini/Documents/stylevenv/lib/python3.6/site-packages/django/core/handlers/base.py in _get_response
                "returned None instead." % (callback.__module__, view_name) ...
▶ Local vars
Request information
USER
AnonymousUser

GET
No GET data

POST
No POST data

FILES
No FILES data

COOKIES
Variable	Value
csrftoken	
'q5wdkO6URvafyLBmTATgSftaaVZm4EZFEbGMUubW90W2Eqg6rObCXp1XW6UBv8BD'
_ga	
'GA1.1.1768471182.1521906722'
_gid	
'GA1.1.929738437.1521906722'
META
Variable	Value
Apple_PubSub_Socket_Render	
'/private/tmp/com.apple.launchd.F2TQwo2X1b/Render'
CONTENT_LENGTH	
''
CONTENT_TYPE	
'text/plain'
CSRF_COOKIE	
'q5wdkO6URvafyLBmTATgSftaaVZm4EZFEbGMUubW90W2Eqg6rObCXp1XW6UBv8BD'
DJANGO_SETTINGS_MODULE	
'boxplotstyletest.settings'
GATEWAY_INTERFACE	
'CGI/1.1'
HOME	
'/Users/barbaradonnini'
HTTP_ACCEPT	
'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8'
HTTP_ACCEPT_ENCODING	
'gzip, deflate, br'
HTTP_ACCEPT_LANGUAGE	
'en-US,en;q=0.9'
HTTP_CACHE_CONTROL	
'max-age=0'
HTTP_CONNECTION	
'keep-alive'
HTTP_COOKIE	
('csrftoken=q5wdkO6URvafyLBmTATgSftaaVZm4EZFEbGMUubW90W2Eqg6rObCXp1XW6UBv8BD; '
 '_ga=GA1.1.1768471182.1521906722; _gid=GA1.1.929738437.1521906722')
HTTP_HOST	
'127.0.0.1:8000'
HTTP_UPGRADE_INSECURE_REQUESTS	
'1'
HTTP_USER_AGENT	
('Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, '
 'like Gecko) Chrome/65.0.3325.181 Safari/537.36')
LANG	
'en_US.UTF-8'
LOGNAME	
'barbaradonnini'
OLDPWD	
'/Users/barbaradonnini/Documents'
PATH	
'/Users/barbaradonnini/Documents/stylevenv/bin:/Applications/MAMP/bin/php/php7.1.8/bin:/opt/local/bin:/opt/local/sbin:/Library/Frameworks/Python.framework/Versions/3.6/bin:/Library/Frameworks/Python.framework/Versions/2.7/bin:/Users/barbaradonnini/anaconda/bin:/Library/Frameworks/Python.framework/Versions/3.6/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin'
PATH_INFO	
'/testnewsletter'
PS1	
'(stylevenv) \\h:\\W \\u\\$ '
PWD	
'/Users/barbaradonnini/Google Drive/Boxplot/boxplot-style-test'
QUERY_STRING	
''
REMOTE_ADDR	
'127.0.0.1'
REMOTE_HOST	
''
REQUEST_METHOD	
'GET'
RUN_MAIN	
'true'
SCRIPT_NAME	
''
SERVER_NAME	
'1.0.0.127.in-addr.arpa'
SERVER_PORT	
'8000'
SERVER_PROTOCOL	
'HTTP/1.1'
SERVER_SOFTWARE	
'WSGIServer/0.2'
SHELL	
'/bin/bash'
SHLVL	
'1'
SSH_AUTH_SOCK	
'/private/tmp/com.apple.launchd.g1e8FNAM9h/Listeners'
TERM	
'xterm-256color'
TERM_PROGRAM	
'Apple_Terminal'
TERM_PROGRAM_VERSION	
'400'
TERM_SESSION_ID	
'EA8840FF-F69C-4753-988F-DB6904986372'
TMPDIR	
'/var/folders/p8/jnj8my255n3bhzd1smz2nqzc0000gn/T/'
TZ	
'America/New_York'
USER	
'barbaradonnini'
VIRTUAL_ENV	
'/Users/barbaradonnini/Documents/stylevenv'
XPC_FLAGS	
'0x0'
XPC_SERVICE_NAME	
'0'
_	
'./manage.py'
__CF_USER_TEXT_ENCODING	
'0x1F5:0x0:0x0'
__PYVENV_LAUNCHER__	
'/Users/barbaradonnini/Documents/stylevenv/bin/python'
wsgi.errors	
<_io.TextIOWrapper name='<stderr>' mode='w' encoding='UTF-8'>
wsgi.file_wrapper	
''
wsgi.input	
<_io.BufferedReader name=6>
wsgi.multiprocess	
False
wsgi.multithread	
True
wsgi.run_once	
False
wsgi.url_scheme	
'http'
wsgi.version	
(1, 0)
Settings
Using settings module boxplotstyletest.settings
Setting	Value
ABSOLUTE_URL_OVERRIDES	
{}
ADMINS	
[]
ALLOWED_HOSTS	
['*']
APPEND_SLASH	
True
AUTHENTICATION_BACKENDS	
['django.contrib.auth.backends.ModelBackend']
AUTH_PASSWORD_VALIDATORS	
'********************'
AUTH_USER_MODEL	
'auth.User'
BASE_DIR	
'/Users/barbaradonnini/Google Drive/Boxplot/boxplot-style-test'
CACHES	
{'default': {'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'}}
CACHE_MIDDLEWARE_ALIAS	
'default'
CACHE_MIDDLEWARE_KEY_PREFIX	
'********************'
CACHE_MIDDLEWARE_SECONDS	
600
CSRF_COOKIE_AGE	
31449600
CSRF_COOKIE_DOMAIN	
None
CSRF_COOKIE_HTTPONLY	
False
CSRF_COOKIE_NAME	
'csrftoken'
CSRF_COOKIE_PATH	
'/'
CSRF_COOKIE_SECURE	
False
CSRF_FAILURE_VIEW	
'django.views.csrf.csrf_failure'
CSRF_HEADER_NAME	
'HTTP_X_CSRFTOKEN'
CSRF_TRUSTED_ORIGINS	
[]
CSRF_USE_SESSIONS	
False
DATABASES	
{'default': {'ATOMIC_REQUESTS': False,
             'AUTOCOMMIT': True,
             'CONN_MAX_AGE': 0,
             'ENGINE': 'django.db.backends.sqlite3',
             'HOST': '',
             'NAME': '/Users/barbaradonnini/Google '
                     'Drive/Boxplot/boxplot-style-test/db.sqlite3',
             'OPTIONS': {},
             'PASSWORD': '********************',
             'PORT': '',
             'TEST': {'CHARSET': None,
                      'COLLATION': None,
                      'MIRROR': None,
                      'NAME': None},
             'TIME_ZONE': None,
             'USER': ''}}
DATABASE_ROUTERS	
[]
DATA_UPLOAD_MAX_MEMORY_SIZE	
2621440
DATA_UPLOAD_MAX_NUMBER_FIELDS	
1000
DATETIME_FORMAT	
'N j, Y, P'
DATETIME_INPUT_FORMATS	
['%Y-%m-%d %H:%M:%S',
 '%Y-%m-%d %H:%M:%S.%f',
 '%Y-%m-%d %H:%M',
 '%Y-%m-%d',
 '%m/%d/%Y %H:%M:%S',
 '%m/%d/%Y %H:%M:%S.%f',
 '%m/%d/%Y %H:%M',
 '%m/%d/%Y',
 '%m/%d/%y %H:%M:%S',
 '%m/%d/%y %H:%M:%S.%f',
 '%m/%d/%y %H:%M',
 '%m/%d/%y']
DATE_FORMAT	
'N j, Y'
DATE_INPUT_FORMATS	
['%Y-%m-%d',
 '%m/%d/%Y',
 '%m/%d/%y',
 '%b %d %Y',
 '%b %d, %Y',
 '%d %b %Y',
 '%d %b, %Y',
 '%B %d %Y',
 '%B %d, %Y',
 '%d %B %Y',
 '%d %B, %Y']
DEBUG	
True
DEBUG_PROPAGATE_EXCEPTIONS	
False
DECIMAL_SEPARATOR	
'.'
DEFAULT_CHARSET	
'utf-8'
DEFAULT_CONTENT_TYPE	
'text/html'
DEFAULT_EXCEPTION_REPORTER_FILTER	
'django.views.debug.SafeExceptionReporterFilter'
DEFAULT_FILE_STORAGE	
'django.core.files.storage.FileSystemStorage'
DEFAULT_FROM_EMAIL	
'Boxplot <[email protected]>'
DEFAULT_INDEX_TABLESPACE	
''
DEFAULT_TABLESPACE	
''
DISALLOWED_USER_AGENTS	
[]
EMAIL_BACKEND	
'django.core.mail.backends.smtp.EmailBackend'
EMAIL_FILE_PATH	
'/Users/barbaradonnini/Google Drive/Boxplot/boxplot-style-test/sent_emails'
EMAIL_HOST	
'smtp.fatcow.com'
EMAIL_HOST_PASSWORD	
'********************'
EMAIL_HOST_USER	
'[email protected]'
EMAIL_PORT	
587
EMAIL_SSL_CERTFILE	
None
EMAIL_SSL_KEYFILE	
'********************'
EMAIL_SUBJECT_PREFIX	
'[Django] '
EMAIL_TIMEOUT	
None
EMAIL_USE_LOCALTIME	
False
EMAIL_USE_SSL	
False
EMAIL_USE_TLS	
True
FILE_CHARSET	
'utf-8'
FILE_UPLOAD_DIRECTORY_PERMISSIONS	
None
FILE_UPLOAD_HANDLERS	
['django.core.files.uploadhandler.MemoryFileUploadHandler',
 'django.core.files.uploadhandler.TemporaryFileUploadHandler']
FILE_UPLOAD_MAX_MEMORY_SIZE	
2621440
FILE_UPLOAD_PERMISSIONS	
None
FILE_UPLOAD_TEMP_DIR	
None
FIRST_DAY_OF_WEEK	
0
FIXTURE_DIRS	
[]
FORCE_SCRIPT_NAME	
None
FORMAT_MODULE_PATH	
None
FORM_RENDERER	
'django.forms.renderers.DjangoTemplates'
IGNORABLE_404_URLS	
[]
INSTALLED_APPS	
['django.contrib.admin',
 'django.contrib.sites',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'whitenoise.runserver_nostatic',
 'django.contrib.staticfiles',
 'stylesite',
 'dashboards',
 'localflavor',
 'accounts',
 'django_comments',
 'mptt',
 'tagging',
 'zinnia',
 'django_extensions',
 'sorl.thumbnail',
 'newsletter']
INTERNAL_IPS	
[]
LANGUAGES	
[('af', 'Afrikaans'),
 ('ar', 'Arabic'),
 ('ast', 'Asturian'),
 ('az', 'Azerbaijani'),
 ('bg', 'Bulgarian'),
 ('be', 'Belarusian'),
 ('bn', 'Bengali'),
 ('br', 'Breton'),
 ('bs', 'Bosnian'),
 ('ca', 'Catalan'),
 ('cs', 'Czech'),
 ('cy', 'Welsh'),
 ('da', 'Danish'),
 ('de', 'German'),
 ('dsb', 'Lower Sorbian'),
 ('el', 'Greek'),
 ('en', 'English'),
 ('en-au', 'Australian English'),
 ('en-gb', 'British English'),
 ('eo', 'Esperanto'),
 ('es', 'Spanish'),
 ('es-ar', 'Argentinian Spanish'),
 ('es-co', 'Colombian Spanish'),
 ('es-mx', 'Mexican Spanish'),
 ('es-ni', 'Nicaraguan Spanish'),
 ('es-ve', 'Venezuelan Spanish'),
 ('et', 'Estonian'),
 ('eu', 'Basque'),
 ('fa', 'Persian'),
 ('fi', 'Finnish'),
 ('fr', 'French'),
 ('fy', 'Frisian'),
 ('ga', 'Irish'),
 ('gd', 'Scottish Gaelic'),
 ('gl', 'Galician'),
 ('he', 'Hebrew'),
 ('hi', 'Hindi'),
 ('hr', 'Croatian'),
 ('hsb', 'Upper Sorbian'),
 ('hu', 'Hungarian'),
 ('ia', 'Interlingua'),
 ('id', 'Indonesian'),
 ('io', 'Ido'),
 ('is', 'Icelandic'),
 ('it', 'Italian'),
 ('ja', 'Japanese'),
 ('ka', 'Georgian'),
 ('kab', 'Kabyle'),
 ('kk', 'Kazakh'),
 ('km', 'Khmer'),
 ('kn', 'Kannada'),
 ('ko', 'Korean'),
 ('lb', 'Luxembourgish'),
 ('lt', 'Lithuanian'),
 ('lv', 'Latvian'),
 ('mk', 'Macedonian'),
 ('ml', 'Malayalam'),
 ('mn', 'Mongolian'),
 ('mr', 'Marathi'),
 ('my', 'Burmese'),
 ('nb', 'Norwegian Bokmål'),
 ('ne', 'Nepali'),
 ('nl', 'Dutch'),
 ('nn', 'Norwegian Nynorsk'),
 ('os', 'Ossetic'),
 ('pa', 'Punjabi'),
 ('pl', 'Polish'),
 ('pt', 'Portuguese'),
 ('pt-br', 'Brazilian Portuguese'),
 ('ro', 'Romanian'),
 ('ru', 'Russian'),
 ('sk', 'Slovak'),
 ('sl', 'Slovenian'),
 ('sq', 'Albanian'),
 ('sr', 'Serbian'),
 ('sr-latn', 'Serbian Latin'),
 ('sv', 'Swedish'),
 ('sw', 'Swahili'),
 ('ta', 'Tamil'),
 ('te', 'Telugu'),
 ('th', 'Thai'),
 ('tr', 'Turkish'),
 ('tt', 'Tatar'),
 ('udm', 'Udmurt'),
 ('uk', 'Ukrainian'),
 ('ur', 'Urdu'),
 ('vi', 'Vietnamese'),
 ('zh-hans', 'Simplified Chinese'),
 ('zh-hant', 'Traditional Chinese')]
LANGUAGES_BIDI	
['he', 'ar', 'fa', 'ur']
LANGUAGE_CODE	
'en-us'
LANGUAGE_COOKIE_AGE	
None
LANGUAGE_COOKIE_DOMAIN	
None
LANGUAGE_COOKIE_NAME	
'django_language'
LANGUAGE_COOKIE_PATH	
'/'
LOCALE_PATHS	
[]
LOGGING	
{}
LOGGING_CONFIG	
'logging.config.dictConfig'
LOGIN_REDIRECT_URL	
'/account'
LOGIN_URL	
'/accounts/login/'
LOGOUT_REDIRECT_URL	
'/'
MANAGERS	
[]
MEDIAFILES_DIRS	
'/Users/barbaradonnini/Google Drive/Boxplot/boxplot-style-test/media'
MEDIA_ROOT	
'/Users/barbaradonnini/Google Drive/Boxplot/boxplot-style-test/media'
MEDIA_URL	
'/media/'
MESSAGE_STORAGE	
'django.contrib.messages.storage.fallback.FallbackStorage'
MIDDLEWARE	
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']
MIGRATION_MODULES	
{}
MONTH_DAY_FORMAT	
'F j'
NEWSLETTER_CONFIRM_EMAIL	
False
NUMBER_GROUPING	
0
PASSWORD_HASHERS	
'********************'
PASSWORD_RESET_TIMEOUT_DAYS	
'********************'
PREPEND_WWW	
False
PROJECT_ROOT	
'/Users/barbaradonnini/Google Drive/Boxplot/boxplot-style-test/boxplotstyletest'
ROOT_URLCONF	
'boxplotstyletest.urls'
SECRET_KEY	
'********************'
SECURE_BROWSER_XSS_FILTER	
False
SECURE_CONTENT_TYPE_NOSNIFF	
False
SECURE_HSTS_INCLUDE_SUBDOMAINS	
False
SECURE_HSTS_PRELOAD	
False
SECURE_HSTS_SECONDS	
0
SECURE_PROXY_SSL_HEADER	
('HTTP_X_FORWARDED_PROTO', 'https')
SECURE_REDIRECT_EXEMPT	
[]
SECURE_SSL_HOST	
None
SECURE_SSL_REDIRECT	
False
SERVER_EMAIL	
'root@localhost'
SESSION_CACHE_ALIAS	
'default'
SESSION_COOKIE_AGE	
1209600
SESSION_COOKIE_DOMAIN	
None
SESSION_COOKIE_HTTPONLY	
True
SESSION_COOKIE_NAME	
'sessionid'
SESSION_COOKIE_PATH	
'/'
SESSION_COOKIE_SECURE	
False
SESSION_ENGINE	
'django.contrib.sessions.backends.db'
SESSION_EXPIRE_AT_BROWSER_CLOSE	
False
SESSION_FILE_PATH	
None
SESSION_SAVE_EVERY_REQUEST	
False
SESSION_SERIALIZER	
'django.contrib.sessions.serializers.JSONSerializer'
SETTINGS_MODULE	
'boxplotstyletest.settings'
SHORT_DATETIME_FORMAT	
'm/d/Y P'
SHORT_DATE_FORMAT	
'm/d/Y'
SIGNING_BACKEND	
'django.core.signing.TimestampSigner'
SILENCED_SYSTEM_CHECKS	
[]
SITE_ID	
1
STATICFILES_DIRS	
[]
STATICFILES_FINDERS	
['django.contrib.staticfiles.finders.FileSystemFinder',
 'django.contrib.staticfiles.finders.AppDirectoriesFinder']
STATICFILES_STORAGE	
'django.contrib.staticfiles.storage.StaticFilesStorage'
STATIC_ROOT	
'/Users/barbaradonnini/Google Drive/Boxplot/boxplot-style-test/static'
STATIC_URL	
'/static/'
TEMPLATES	
[{'APP_DIRS': True,
  'BACKEND': 'django.template.backends.django.DjangoTemplates',
  'DIRS': ['/Users/barbaradonnini/Google '
           'Drive/Boxplot/boxplot-style-test/templates'],
  'OPTIONS': {'context_processors': ['django.template.context_processors.debug',
                                     'django.contrib.auth.context_processors.auth',
                                     'django.template.context_processors.i18n',
                                     'django.template.context_processors.request',
                                     'django.contrib.messages.context_processors.messages',
                                     'zinnia.context_processors.version']}}]
TEST_NON_SERIALIZED_APPS	
[]
TEST_RUNNER	
'django.test.runner.DiscoverRunner'
THOUSAND_SEPARATOR	
','
TIME_FORMAT	
'P'
TIME_INPUT_FORMATS	
['%H:%M:%S', '%H:%M:%S.%f', '%H:%M']
TIME_ZONE	
'America/New_York'
USE_ETAGS	
False
USE_I18N	
True
USE_L10N	
True
USE_THOUSAND_SEPARATOR	
False
USE_TZ	
True
USE_X_FORWARDED_HOST	
False
USE_X_FORWARDED_PORT	
False
WSGI_APPLICATION	
'boxplotstyletest.wsgi.application'
X_FRAME_OPTIONS	
'SAMEORIGIN'
YEAR_MONTH_FORMAT	
'F Y'
You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard page generated by the handler for this status code.

Interesting, there is nothing in your code that suggests this. Maybe try running exactly the TemplateView example and see what it does, to be sure it's not newsletter dependent. You could also help me help you by giving me the full Python stack trace ('Click for copy paste mode') instead of only the first few lines.

https://docs.djangoproject.com/en/2.0/ref/class-based-views/base/#django.views.generic.base.TemplateView