[Kolab-devel] Caldav Problems

Hi all,

I am currently trying to get the CALDAV plugin(s) for Roundcube working 
on my webserver (Using Roundcube 1.0.1, no Kolab Groupware involved).
Looks like I am having difficulties getting the latest and correct 
version of the necessary files from 
https://gitlab.awesome-it.de/kolab/roundcube-plugins

What I did so far:
# git clone https://gitlab.awesome-it.de/kolab/roundcube-plugins.git 
plugins-caldav
# cd plugins-caldav
# git checkout roundcubemail-plugins-kolab-caldav-3.1.11-r1

After that I added "$config['calendar_driver'] = array("kolab", 
"caldav", "ical");" to config.inc.php
(config.inc.php header says "Version 0.7-beta", is that correct?)
It's a bit odd that all other settings/variables in this file start with 
"$rcmail_config" instead of "$config"

In addition I applied the three .sql files for caldav, ical and calendar 
- no problems.

Upon adding a new caldav calendar in Roundcube I get some serious php 
warnings/errors in the logs:

May 28 09:48:31 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:31 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:31 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:32 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET /?_task=calendar)
May 28 09:48:46 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET 
/?_task=calendar&_action=calendar&action=form-new&driver=caldav&_=1401263312288)
May 28 09:48:49 sunrise roundcube: PHP Error: required kolabformat 
module not found (GET 
/?_task=mail&_mbox=INBOX&_folderlist=1&_list=1&_uids=274%2C280%2C281&_last=1401263268&_action=refresh&_remote=1&_unlock=loading1401263328858&_=1401262187819)
May 28 09:49:13 sunrise roundcube: PHP Error: required kolabformat 
module not found (POST 
/?_task=calendar&_action=calendar?_task=&_action=)
May 28 09:49:13 sunrise roundcube: PHP Fatal error:  Class 
vobject_location_property contains 3 abstract methods and must therefore 
be declared abstract or implement the remaining methods 
(Sabre\VObject\Property::getValueType, 
Sabre\VObject\Property::setRawMimeDirValue, 
Sabre\VObject\Property::getRawMimeDirValue) in 
/var/www/mail.tschiggerl.name/plugins/libcalendaring/libvcalendar.php on 
line 1061

(I read through the 
http://lists.kolab.org/pipermail/devel/2014-February/014878.html 
postings but it didn't help me :( )

Could you please point me in the right direction - I am stuck :(