I would say the error message is not very informative.
Resolved this issue. Something amiss with the configuration. I created a fresh Facebook project and configured app_id in Android manifest file once again. Further,
- Ensure that configurations in Facebook developer console are correct.
- Ensure that developer is friend of the Facebook Admin.
- When you start typing names in the box it should automatically populate the name.
- Add the person.
Pending status will go automatically in sometime.