Twitter redirect to a empty URL

Developers of Anvard,

Why is the project on a low development stage. This plugin is a 'welcome' tool for integrating social logins. Currently we have is worked with Confide, and with one-click the social user can create a new user. But when clicked on the Twitter-button, we get a redirect to an empty URL, who have the same problem, and how to fix this?

Live demo @ biq.fiberserver.nl/login