RT GSync: Google Calendar, Contacts, Drive Sync

Hello, I've installed the Plugin on a SugarCRM on Demand Instance, Sugar Vanilla 7.9.2.0 Ent. We need to test it and make it available for a customer as soon as possible. Unfortunatley after insallation, repair and rebuild and configuration of the plugin we get an http Error 500 Code: According to the logs we got from sugarcrm for this instance, we get the following error: [2017-11-13T15:28:42+00:00] [error] [host contentgarden.demo.sugarcrm.eu] [client 86.217.148.124] PHP Fatal error: require_once(): Failed opening required 'cache/Google_Cache.php' (include_path='/mnt/sugar/shadowed/contentgarden.demo.sugarcrm.eu/custom/include/Google/google-api-php-client/src:/mnt/sugar/7.9.2.0/ent:/mnt/sugar/7.9.2.0/ent/vendor:.:/usr/share/pear:/usr/share/php') in /mnt/sugar/shadowed/contentgarden.demo.sugarcrm.eu/custom/include/Google/google-api-php-client/src/Google_Client.php on line 58, referer: https://demobuilder.sugarcrmdemo.com/?id=59df7a567d10c97ec1ddd9f1 [2017-11-13T15:28:42+00:00] [error] [host contentgarden.demo.sugarcrm.eu] [client 86.217.148.124] PHP Warning: require_once(cache/Google_Cache.php): failed to open stream: operation failed in /mnt/sugar/shadowed/contentgarden.demo.sugarcrm.eu/custom/include/Google/google-api-php-client/src/Google_Client.php on line 58, referer: https://demobuilder.sugarcrmdemo.com/?id=59df7a567d10c97ec1ddd9f1 Please advise on what to do. You can contact me directly under: thomas.rychliik@kinamu.com or +43 676 835 65 611 Kind Regards Thomas J. Rychlik