ISE: Application won't start on Production

[marshalc]

supervisord keeps showing status of starting as the process survives a second, and then fails. Testing by calling run server results in this error:

python manage.py runserver 0.0.0.0:8000
DEBUG: Loading settings from production
DEBUG: Loading settings from production
Performing system checks...

System check identified no issues (0 silenced).
January 12, 2018 - 16:41:08
Django version 2.0.1, using settings 'config.settings.production'
Starting development server at http://0.0.0.0:8000/
Quit the server with CONTROL-C.
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7fafccc22950>
Traceback (most recent call last):
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 141, in inner_run
    handler = self.get_handler(*args, **options)
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/site-packages/django/contrib/staticfiles/management/commands/runserver.py", line 27, in get_handler
    handler = super().get_handler(*args, **options)
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 66, in get_handler
    return get_internal_wsgi_application()
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/site-packages/django/core/servers/basehttp.py", line 44, in get_internal_wsgi_application
    return import_string(app_path)
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/site-packages/django/utils/module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 665, in exec_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "/sites/py3_cope/cope_repo/config/wsgi.py", line 18, in <module>
    application = get_wsgi_application()
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/site-packages/django/core/wsgi.py", line 13, in get_wsgi_application
    return WSGIHandler()
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/site-packages/django/core/handlers/wsgi.py", line 140, in __init__
    self.load_middleware()
  File "/sites/.virtualenvs/py3_cope/lib/python3.5/site-packages/django/core/handlers/base.py", line 39, in load_middleware
    mw_instance = middleware(handler)
TypeError: __init__() takes 1 positional argument but 2 were given

Investigating...

[marshalc]

Problem doesn't occur on staging server with the same codebase, so this seems to be unique to the production server... (a bit like the sqlite problem perhaps?)

[marshalc]

Removing some redundant middleware in production has seemingly caused this to disappear. Closing.