The installation for Google Apps didn't finish for your domain. This used to happen automatically but now users need to click continue after installing the app to set it up. To finish the installation login to the Google Apps admin console and follow these steps:

1. Click the 'Marketplace Apps' button

2. Find 'Centreli' and click on the application to access settings

3. Click 'Settings'

4. On the right pane under 'Additional Settings' click 'Go to Centreli for Setup'