iCal/CardDAV plugin

[Henning]

Hi!

I recently setup the iCal/CalDAV Client plugin for roundcubemail, but it
does not seem to work properly. I notice this php-error:

PHP Fatal error:  Cannot use object of type kolab_storage_cache_event as
array in
/usr/share/roundcubemail/plugins/calendar/drivers/kolab/kolab_calendar.php

Does anybody run this modified calendar-plugin?
https://kolab.org/blog/daniel-morlock/2014/05/10/caldavical-support-kolab

Henning