There are errors in the howto:
# Change the following basing on how much time you want data from Seafile cached $config['fileapi_seafile_cache'] = '14d';
(it gives an error in the log file: DB Error: Configuration error. Unsupported cache driver: 14d in /usr/share/roundcubemail/program/lib/Roundcube/rcube_cache.php on line 64)
should be changed to (as per https://github.com/gtgt/kolab-chwala/blob/master/config/config.inc.php.dist):
// Enables caching of some SeaFile information e.g. folders list // Note: 'db', 'apc' and 'memcache' are supported $config['fileapi_seafile_cache'] = 'db'; // Expiration time of SeaFile cache entries $config['fileapi_seafile_cache_ttl'] = '7d';
Also this error can lead to the caldav/cardav updates from the clients as in my case.