==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: minimal CentOS 6.6
- Roundcube version: 1.0.1
- Related log if you're reporting an issue:
====

I wasn't able to install agenda and calendar plugins in Roundcube. Both together doesn't work. When they run together, only carddav works. Calendar shows a blank page.
I did many tests but it was impossible.

Users prefer Roundcube over SOGo because Roundcube has more plugins and it has a more elegant visual aspect, but Roundcube doesn't have enterprise (colaborative) agenda nor calendar.
I installed SOGo to provide caldav and carddav services to Roundcube but I wasn't able to run both cardav nor caldav plugins together in Roundcube.

I followed these instructions: https://gitlab.awesome-it.de/kolab/roun … ure_caldav

There is some problem with Sabredav:
Jan 17 23:42:58 mail2 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/roundcubemail-1.0.1/plugins/libcalendaring/libvcalendar.php on line 1121
Jan 17 23:44:52 mail2 roundcube: BACKEND: (get_record_from_carddav) Request for VCF '475BAEA5-AD95-4DFE-876D-B5EA101181FC.vcf' which doesn't exist on the server.
Jan 17 23:45:26 mail2 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/roundcubemail-1.0.1/plugins/libcalendaring/libvcalendar.php on line 1121

At his moment I am using carddav plugin from https://github.com/blind-coder/rcmcarddav

Roundcube plugins:
acl     1.2     GNU GPLv3+    
automatic_addressbook     0.4.0     GPL-3.0+    
calendar     0.9.1     GNU AGPLv3
carddav from https://github.com/blind-coder/rcmcarddav
globaladdressbook     1.10-git     GPL-3.0    
managesieve     7.2     GNU GPLv3+    
password     3.4     GNU GPLv3+    
zipdownload     2.0     GNU GPLv3+

What would be the right way to install rounducube calendar and roundcube cardav both together?
What Roundcube calendar plugin and carddav plugin should I install?

Thanks in advance