IntegrityError at /users/NOT NULL constraint failed: demo_user.usernameRequest Method: POSTRequest URL: http://www.demo.gamiflow.com:8000/users/Django Version: 1.11.1Python Executable: /var/www/test/venv/bin/uwsgiPython Version: 3.4.2Python Path: ['.', '', '/var/www/test/venv/lib/python3.4', '/var/www/test/venv/lib/python3.4/plat-x86_64-linux-gnu', '/var/www/test/venv/lib/python3.4/lib-dynload', '/usr/lib/python3.4', '/usr/lib/python3.4/plat-x86_64-linux-gnu', '/var/www/test/venv/lib/python3.4/site-packages']Server time: Mon, 30 Oct 2017 13:27:43 +0000Installed Applications:['corsheaders', 'demo.apps.DemoConfig', 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'django_filters', 'rest_framework', 'taggit']Installed Middleware:['corsheaders.middleware.CorsMiddleware', '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']Traceback:  File "/var/www/test/venv/lib/python3.4/site-packages/django/db/backends/utils.py" in execute  65.                 return self.cursor.execute(sql, params)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/backends/sqlite3/base.py" in execute  328.         return Database.Cursor.execute(self, query, params)            The above exception (NOT NULL constraint failed: demo_user.username) was the direct cause of the following exception:      File "/var/www/test/venv/lib/python3.4/site-packages/django/core/handlers/exception.py" in inner  41.             response = get_response(request)File "/var/www/test/venv/lib/python3.4/site-packages/django/core/handlers/base.py" in _get_response  187.                 response = self.process_exception_by_middleware(e, request)File "/var/www/test/venv/lib/python3.4/site-packages/django/core/handlers/base.py" in _get_response  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)File "/var/www/test/venv/lib/python3.4/site-packages/django/views/decorators/csrf.py" in wrapped_view  58.         return view_func(*args, **kwargs)File "/var/www/test/venv/lib/python3.4/site-packages/rest_framework/viewsets.py" in view  86.             return self.dispatch(request, *args, **kwargs)File "/var/www/test/venv/lib/python3.4/site-packages/rest_framework/views.py" in dispatch  489.             response = self.handle_exception(exc)File "/var/www/test/venv/lib/python3.4/site-packages/rest_framework/views.py" in handle_exception  449.             self.raise_uncaught_exception(exc)File "/var/www/test/venv/lib/python3.4/site-packages/rest_framework/views.py" in dispatch  486.             response = handler(request, *args, **kwargs)File "/var/www/test/venv/lib/python3.4/site-packages/rest_framework/mixins.py" in create  21.         self.perform_create(serializer)File "/var/www/test/venv/lib/python3.4/site-packages/rest_framework/mixins.py" in perform_create  26.         serializer.save()File "/var/www/test/venv/lib/python3.4/site-packages/rest_framework/serializers.py" in save  215.             self.instance = self.create(validated_data)File "./demo/serializers.py" in create  68.         user = User.objects.create(username=validated_data.get('username'), email=validated_data.get('email'))File "/var/www/test/venv/lib/python3.4/site-packages/django/db/models/manager.py" in manager_method  85.                 return getattr(self.get_queryset(), name)(*args, **kwargs)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/models/query.py" in create  394.         obj.save(force_insert=True, using=self.db)File "/var/www/test/venv/lib/python3.4/site-packages/django/contrib/auth/base_user.py" in save  80.         super(AbstractBaseUser, self).save(*args, **kwargs)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/models/base.py" in save  806.                        force_update=force_update, update_fields=update_fields)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/models/base.py" in save_base  836.             updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/models/base.py" in _save_table  922.             result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/models/base.py" in _do_insert  961.                                using=using, raw=raw)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/models/manager.py" in manager_method  85.                 return getattr(self.get_queryset(), name)(*args, **kwargs)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/models/query.py" in _insert  1061.         return query.get_compiler(using=using).execute_sql(return_id)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in execute_sql  1099.                 cursor.execute(sql, params)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/backends/utils.py" in execute  80.             return super(CursorDebugWrapper, self).execute(sql, params)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/backends/utils.py" in execute  65.                 return self.cursor.execute(sql, params)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/utils.py" in __exit__  94.                 six.reraise(dj_exc_type, dj_exc_value, traceback)File "/var/www/test/venv/lib/python3.4/site-packages/django/utils/six.py" in reraise  685.             raise value.with_traceback(tb)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/backends/utils.py" in execute  65.                 return self.cursor.execute(sql, params)File "/var/www/test/venv/lib/python3.4/site-packages/django/db/backends/sqlite3/base.py" in execute  328.         return Database.Cursor.execute(self, query, params)Exception Type: IntegrityError at /users/Exception Value: NOT NULL constraint failed: demo_user.usernameRequest information:USER: AnonymousUserGET: No GET dataPOST: No POST dataFILES: No FILES dataCOOKIES: No cookie dataMETA:CONTENT_LENGTH = '58'CONTENT_TYPE = 'application/x-www-form-urlencoded'DOCUMENT_ROOT = '/usr/share/nginx/html'HTTP_ACCEPT = 'application/json, text/plain, */*'HTTP_ACCEPT_ENCODING = 'gzip, deflate'HTTP_ACCEPT_LANGUAGE = 'pl-PL,pl;q=0.8,en-US;q=0.6,en;q=0.4,es;q=0.2,gl;q=0.2'HTTP_CONNECTION = 'keep-alive'HTTP_CONTENT_LENGTH = '58'HTTP_CONTENT_TYPE = 'application/x-www-form-urlencoded'HTTP_HOST = 'www.demo.gamiflow.com:8000'HTTP_ORIGIN = 'http://localhost:4200'HTTP_REFERER = 'http://localhost:4200/games'HTTP_USER_AGENT = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36'PATH_INFO = '/users/'QUERY_STRING = ''REMOTE_ADDR = '79.173.24.166'REMOTE_PORT = '49923'REQUEST_METHOD = 'POST'REQUEST_SCHEME = 'http'REQUEST_URI = '/users/'SCRIPT_NAME = ''SERVER_NAME = 'www.demo.gamiflow.com'SERVER_PORT = '8000'SERVER_PROTOCOL = 'HTTP/1.1'uwsgi.node = b'gamiflow-1'uwsgi.version = b'2.0.15'wsgi.errors = <_io.TextIOWrapper name=2 mode='w' encoding='UTF-8'>wsgi.file_wrapper = ''wsgi.input = <uwsgi._Input object at 0x7f4bdc3a8dc8>wsgi.multiprocess = Falsewsgi.multithread = Falsewsgi.run_once = Falsewsgi.url_scheme = 'http'wsgi.version = Settings:Using settings module gamiflow.settingsABSOLUTE_URL_OVERRIDES = {}ADMINS = []ALLOWED_HOSTS = ['www.demo.gamiflow.com']APPEND_SLASH = TrueAUTHENTICATION_BACKENDS = ['django.contrib.auth.backends.ModelBackend']AUTH_PASSWORD_VALIDATORS = '********************'AUTH_USER_MODEL = 'demo.User'BASE_DIR = '/var/www/test/gamiflow'CACHES = {'default': {'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'}}CACHE_MIDDLEWARE_ALIAS = 'default'CACHE_MIDDLEWARE_KEY_PREFIX = '********************'CACHE_MIDDLEWARE_SECONDS = 600CORS_ORIGIN_ALLOW_ALL = TrueCSRF_COOKIE_AGE = 31449600CSRF_COOKIE_DOMAIN = NoneCSRF_COOKIE_HTTPONLY = FalseCSRF_COOKIE_NAME = 'csrftoken'CSRF_COOKIE_PATH = '/'CSRF_COOKIE_SECURE = FalseCSRF_FAILURE_VIEW = 'django.views.csrf.csrf_failure'CSRF_HEADER_NAME = 'HTTP_X_CSRFTOKEN'CSRF_TRUSTED_ORIGINS = []CSRF_USE_SESSIONS = FalseDATABASES = {'default': {'HOST': '', 'TEST': {'CHARSET': None, 'MIRROR': None, 'COLLATION': None, 'NAME': None}, 'TIME_ZONE': None, 'ENGINE': 'django.db.backends.sqlite3', 'OPTIONS': {}, 'NAME': '/var/www/test/gamiflow/db.sqlite3', 'PORT': '', 'PASSWORD': '********************', 'CONN_MAX_AGE': 0, 'ATOMIC_REQUESTS': False, 'USER': '', 'AUTOCOMMIT': True}}DATABASE_ROUTERS = []DATA_UPLOAD_MAX_MEMORY_SIZE = 2621440DATA_UPLOAD_MAX_NUMBER_FIELDS = 1000DATETIME_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 = TrueDEBUG_PROPAGATE_EXCEPTIONS = FalseDECIMAL_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 = 'webmaster@localhost'DEFAULT_INDEX_TABLESPACE = ''DEFAULT_TABLESPACE = ''DISALLOWED_USER_AGENTS = []EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'EMAIL_HOST = 'localhost'EMAIL_HOST_PASSWORD = '********************'EMAIL_HOST_USER = ''EMAIL_PORT = 25EMAIL_SSL_CERTFILE = NoneEMAIL_SSL_KEYFILE = '********************'EMAIL_SUBJECT_PREFIX = '[Django] 'EMAIL_TIMEOUT = NoneEMAIL_USE_LOCALTIME = FalseEMAIL_USE_SSL = FalseEMAIL_USE_TLS = FalseFILE_CHARSET = 'utf-8'FILE_UPLOAD_DIRECTORY_PERMISSIONS = NoneFILE_UPLOAD_HANDLERS = ['django.core.files.uploadhandler.MemoryFileUploadHandler', 'django.core.files.uploadhandler.TemporaryFileUploadHandler']FILE_UPLOAD_MAX_MEMORY_SIZE = 2621440FILE_UPLOAD_PERMISSIONS = NoneFILE_UPLOAD_TEMP_DIR = NoneFIRST_DAY_OF_WEEK = 0FIXTURE_DIRS = []FORCE_SCRIPT_NAME = NoneFORMAT_MODULE_PATH = NoneFORM_RENDERER = 'django.forms.renderers.DjangoTemplates'IGNORABLE_404_URLS = []INSTALLED_APPS = ['corsheaders', 'demo.apps.DemoConfig', 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'django_filters', 'rest_framework', 'taggit']INTERNAL_IPS = []JWT_AUTH = {'JWT_VERIFY': True, 'JWT_AUTH_COOKIE': None, 'JWT_PAYLOAD_GET_USER_ID_HANDLER': 'rest_framework_jwt.utils.jwt_get_user_id_from_payload_handler', 'JWT_PAYLOAD_HANDLER': 'rest_framework_jwt.utils.jwt_payload_handler', 'JWT_SECRET_KEY': '********************', 'JWT_PRIVATE_KEY': '********************', 'JWT_GET_USER_SECRET_KEY': '********************', 'JWT_ALLOW_REFRESH': True, 'JWT_ALGORITHM': 'HS256', 'JWT_AUDIENCE': None, 'JWT_RESPONSE_PAYLOAD_HANDLER': 'rest_framework_jwt.utils.jwt_response_payload_handler', 'JWT_ISSUER': None, 'JWT_DECODE_HANDLER': 'rest_framework_jwt.utils.jwt_decode_handler', 'JWT_ENCODE_HANDLER': 'rest_framework_jwt.utils.jwt_encode_handler', 'JWT_PUBLIC_KEY': '********************', 'JWT_EXPIRATION_DELTA': datetime.timedelta(0, 300), 'JWT_VERIFY_EXPIRATION': True, 'JWT_AUTH_HEADER_PREFIX': 'JWT', 'JWT_LEEWAY': 0, 'JWT_REFRESH_EXPIRATION_DELTA': datetime.timedelta(0, 3600)}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'), ('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 BokmĂĽl'), ('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 = NoneLANGUAGE_COOKIE_DOMAIN = NoneLANGUAGE_COOKIE_NAME = 'django_language'LANGUAGE_COOKIE_PATH = '/'LOCALE_PATHS = []LOGGING = {}LOGGING_CONFIG = 'logging.config.dictConfig'LOGIN_REDIRECT_URL = '/accounts/profile/'LOGIN_URL = '/accounts/login/'LOGOUT_REDIRECT_URL = NoneMANAGERS = []MEDIA_ROOT = '/var/www/test/gamiflow/media'MEDIA_URL = '/media/'MESSAGE_STORAGE = 'django.contrib.messages.storage.fallback.FallbackStorage'MIDDLEWARE = ['corsheaders.middleware.CorsMiddleware', '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']MIDDLEWARE_CLASSES = ['django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware']MIGRATION_MODULES = {}MONTH_DAY_FORMAT = 'F j'NUMBER_GROUPING = 0PASSWORD_HASHERS = '********************'PASSWORD_RESET_TIMEOUT_DAYS = '********************'PREPEND_WWW = FalseREST_FRAMEWORK = {'DEFAULT_AUTHENTICATION_CLASSES': ('rest_framework_jwt.authentication.JSONWebTokenAuthentication', 'rest_framework.authentication.SessionAuthentication', 'rest_framework.authentication.BasicAuthentication'), 'DEFAULT_PERMISSION_CLASSES': ('rest_framework.permissions.AllowAny',), 'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.LimitOffsetPagination', 'PAGE_SIZE': 20}ROOT_URLCONF = 'gamiflow.urls'SECRET_KEY = '********************'SECURE_BROWSER_XSS_FILTER = FalseSECURE_CONTENT_TYPE_NOSNIFF = FalseSECURE_HSTS_INCLUDE_SUBDOMAINS = FalseSECURE_HSTS_PRELOAD = FalseSECURE_HSTS_SECONDS = 0SECURE_PROXY_SSL_HEADER = NoneSECURE_REDIRECT_EXEMPT = []SECURE_SSL_HOST = NoneSECURE_SSL_REDIRECT = FalseSERVER_EMAIL = 'root@localhost'SESSION_CACHE_ALIAS = 'default'SESSION_COOKIE_AGE = 1209600SESSION_COOKIE_DOMAIN = NoneSESSION_COOKIE_HTTPONLY = TrueSESSION_COOKIE_NAME = 'sessionid'SESSION_COOKIE_PATH = '/'SESSION_COOKIE_SECURE = FalseSESSION_ENGINE = 'django.contrib.sessions.backends.db'SESSION_EXPIRE_AT_BROWSER_CLOSE = FalseSESSION_FILE_PATH = NoneSESSION_SAVE_EVERY_REQUEST = FalseSESSION_SERIALIZER = 'django.contrib.sessions.serializers.JSONSerializer'SETTINGS_MODULE = 'gamiflow.settings'SHORT_DATETIME_FORMAT = 'm/d/Y P'SHORT_DATE_FORMAT = 'm/d/Y'SIGNING_BACKEND = 'django.core.signing.TimestampSigner'SILENCED_SYSTEM_CHECKS = []STATICFILES_DIRS = []STATICFILES_FINDERS = ['django.contrib.staticfiles.finders.FileSystemFinder', 'django.contrib.staticfiles.finders.AppDirectoriesFinder']STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.StaticFilesStorage'STATIC_ROOT = NoneSTATIC_URL = '/static/'TEMPLATES = [{'APP_DIRS': True, 'DIRS': [], 'OPTIONS': {'context_processors': ['django.template.context_processors.debug', 'django.template.context_processors.request', 'django.contrib.auth.context_processors.auth', 'django.contrib.messages.context_processors.messages']}, 'BACKEND': 'django.template.backends.django.DjangoTemplates'}]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 = 'UTC'USE_ETAGS = FalseUSE_I18N = TrueUSE_L10N = TrueUSE_THOUSAND_SEPARATOR = FalseUSE_TZ = TrueUSE_X_FORWARDED_HOST = FalseUSE_X_FORWARDED_PORT = FalseWSGI_APPLICATION = 'gamiflow.wsgi.application'X_FRAME_OPTIONS = 'SAMEORIGIN'YEAR_MONTH_FORMAT = 'F Y'You're seeing this error because you have DEBUG = True in yourDjango settings file. Change that to False, and Django willdisplay a standard page generated by the handler for this status code.