Error when adding application record for django-rest-framework-social-oauth2

I am following the instructions for django-rest-framework-social-oauth2 at https://pypi.python.org/pypi/django-rest-framework-social-oauth2/0.0.4

When I attempt to add an application record via "Home › Oauth2_Provider › Applications › Add application", I get the error message "Select a valid choice. That choice is not one of the available choices."  This error appears to be on the user field, where I specified the Django superuser "daniel".

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