You are attempting to use the **GitHub auth backend**, but it is not
properly configured. To configure, please check the following:

* You have added `{{ root_domain_uri }}/complete/github/` as the callback URL
in the OAuth application in GitHub. You can create OAuth apps from
[GitHub's developer site](https://github.com/settings/developers).

* You have set `{{ client_id_key_name }}` in `{{ settings_path }}` and
`social_auth_github_secret` in `{{ secrets_path }}` with the values
from your OAuth application.

* Navigate back to the login page and attempt the GitHub auth flow again.