ImproperlyConfigured: Middleware is missing or misordered

ImproperlyConfigured: Middleware missing or misordered

$ python -c "from django.conf import settings; print(settings.MIDDLEWARE)"
# Error occurs at runtime if required middleware isn't present

Why this happens

Required middleware like SessionMiddleware, CsrfViewMiddleware, or AuthenticationMiddleware is not in MIDDLEWARE, or ordering breaks dependencies.

Fix

Add required middleware and keep recommended order: security, sessions, common, CSRF, auth, messages, clickjacking.

Wrong code

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
]

Fixed code

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',
]