Just add Django’s Sites framework to your apps and set SITE_ID to 1 in your settings.
INSTALLED_APPS = [ ... 'django.contrib.sites', ] SITE_ID = 1
Why does this happen?
Django’s Sites Framework is a contributed module bundled with the core library that allows for the use of a single Django application/codebase with different sites (that can use different databases, logic in views, etc). The SITE_ID setting, as stated in the docs, “is used so that application data can hook into specific sites and a single database can manage content for multiple sites.”
In this particular case AllAuth requires the Sites Framework in order to function properly. Many other third-party libraries are built to safely handle cases where multiple sites may be present and as such may be best .