UberConference for Google Docs

I discovered a very interesting app, UberConference, this afternoon.  The only problem is that it is not working right now.  I will have to try it later.  It has lots of potential for group work.  Essentially, the user can establish a webinar connection to collaborative work.  The app is free.  If you have Google Docs open, click Add-ons > Search for UberConference.  Once it is downloaded, click it to activate the app.  When the app works correctly, it should display a phone number for collaborators to use.  You can add the email addresses for others and the app will send an email to the users with the phone number.
After I activated the app, I received an error message stating that the app could not connect with the server.  I tried it again and UberConference appeared on the right side of the window, but it was blank (indicating it did not connect with the server).
A YouTube video displaying how the app "should" work is below.