服务器启动时出现Django异常-找不到模块

Question

I have searched online for other solutions with little luck. Posting here is a last resort.

Everything was working well with my Django project. Then suddenly it stopped running the server as it used to. I'm not sure at all what I have done wrong.

The issue is persistent across all of the git branches (it wasn't like this before) - making it even more confusing as the problem is not isolated to my branch only.

Here is the error traceback:

    WARNINGS:
?: (1_7.W001) MIDDLEWARE_CLASSES is not set.
    HINT: Django 1.7 changed the global defaults for the MIDDLEWARE_CLASSES. django.contrib.sessions.middleware.SessionMiddleware, django.contrib.auth.middleware.AuthenticationMiddleware, and django.contrib.messages.middleware.MessageMiddleware were removed from the defaults. If your project needs these middleware then you should configure this setting.

System check identified 1 issue (0 silenced).
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x000001A7227EB598>
Traceback (most recent call last):
  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\venv\lib\site-packages\django\utils\autoreload.py", line 229, in wrapper
    fn(*args, **kwargs)
  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\venv\lib\site-packages\django\core\management\commands\runserver.py", line 116, in inner_run
    self.check_migrations()
  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\venv\lib\site-packages\django\core\management\commands\runserver.py", line 168, in check_migrations
    executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\venv\lib\site-packages\django\db\migrations\executor.py", line 19, in __init__
    self.loader = MigrationLoader(self.connection)
  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\venv\lib\site-packages\django\db\migrations\loader.py", line 47, in __init__
    self.build_graph()
  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\venv\lib\site-packages\django\db\migrations\loader.py", line 185, in build_graph
    self.load_disk()
  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\venv\lib\site-packages\django\db\migrations\loader.py", line 103, in load_disk
    migration_module = import_module("%s.%s" % (module_name, migration_name))
  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\venv\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\connect_therapy\migrations\0021_auto_20180313_1946.py", line 4, in <module>
    import django.contrib.auth.base_user
ModuleNotFoundError: No module named 'django.contrib.auth.base_user'

Also, note that I tried changing to MIDDLEWARE_CLASSES [...] in settings.py - but it didnt help.

Here is settings.py:

"""
Django settings for mysite project.
Generated by 'django-admin startproject' using Django 1.11.7.
For more information on this file, see
https://docs.djangoproject.com/en/1.11/topics/settings/
For the full list of settings and their values, see
https://docs.djangoproject.com/en/1.11/ref/settings/
"""

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'key'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True # should be true unless doing test on local network

ALLOWED_HOSTS = ['*'] # should be [] unless doing test on local network (then it should be ['*']


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'co.apps.CTherapyConfig',
    "sslserver", 
]

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',
]

ROOT_URLCONF = 'mysite.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        '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',
            ],
        },
    },
]

WSGI_APPLICATION = 'mysite.wsgi.application'


# Database
# https://docs.djangoproject.com/en/1.11/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}


# Password validation
# https://docs.djangoproject.com/en/1.11/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]

# This must be changed for production
EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'

# Internationalization
# https://docs.djangoproject.com/en/1.11/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

TWILIO_PHONE_NUMBER = '+number'

TWILIO_ACC_SID = 'key'

TWILIO_AUTH_TOKEN = 'token'


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/1.11/howto/static-files/

STATIC_URL = '/static/'

Any ideas/suggestions are welcome.

Just to reiterate. This came out of the blue. No idea what caused it.

Thank you.

Answer 1

It came out because something changed in your project and a migration now fails.

In the error log you can see

  File "C:\Users\ASUS\PycharmProjects\5CCS2SEG_Major\connect_therapy\migrations\0021_auto_20180313_1946.py", line 4, in <module>
    import django.contrib.auth.base_user
ModuleNotFoundError: No module named 'django.contrib.auth.base_user'

What that migration does? Is still valid or the project is changed and the migration try to load resources that are not anymore available?

If you run python manage.py shell are you able to import from 'django.contrib.auth.base_user'? The problem seems to be in that migration

Answer 2

The 'solution' at the end was to just make a new virtual environment. For some reason the old one messed up.