Problem with an elipsis when loading the Django server

 

It looks like your AUTHENTICATION_BACKENDS setting [Django-doc] contains an ellipsis (...). Indeed:

AUTHENTICATION_BACKENDS = [
    # Needed to login by username in Django admin, regardless of `allauth`
    'django.contrib.auth.backends.ModelBackend',

    # `allauth` specific authentication methods, such as login by e-mail
    'allauth.account.auth_backends.AuthenticationBackend',
    ... # <- an ellipsis
]

You should remove this, so that the AUTHENTICATION_BACKENDS is:

AUTHENTICATION_BACKENDS = [
    # Needed to login by username in Django admin, regardless of `allauth`
    'django.contrib.auth.backends.ModelBackend',

    # `allauth` specific authentication methods, such as login by e-mail
    'allauth.account.auth_backends.AuthenticationBackend',
]

This will solve your problem