I only installed the 'settings' and 'google_contacts' plugins. I go to the server settings and select Use Google Contacts, when I go to "Address Book" I get a HTTP 500 error. I uploaded the "Zend" folder to "/rc3/program/lib/Zend/" (rc3 is the folder I have roundcube installed...)
I do have the config.inc.php file in the config folder of the google_contacts folder. I didn´t change anything in this file...
I also ran the script to generate the table google_contacts in MySQL.
What else do I need to check?