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Apparently the construction with getattr() in settings.py of django-locking doesn’t work anymore (because Django’s Settings object raises AttributeError?) which is surprising to me. I can’t test right now, unfortunately.
The good news is that simply setting ADMIN_URL = '/admin/' in your settings will most likely fix this issue.
The bad news is that you’ll probably run into a few more that may not be easy to fix, but who knows…
Source:stackexchange.com