Confirm this appointment with Google Calendar

Hi,

I have installed Appointments, market press and Domain Mapping and I'm trying to make them work together.

From front-end does not confirm the appointment if I activate the checkbox of Google Calendar (Access Google Calendar and submit appointment). This is loading and does nothing

My site is
http://dallas-design.info/store/products/appointment/

Super Admin:
http://www.austin-design-qa.info
[login info removed by moderator]

I have something configured incorrectly?