Calendar event error - Kolab 16

[Fábio Sousa]

Hello,

I'm having a few issues with a new install of Kolab 16 on my Centos 7.6 
server .

I've been trying to configure the calendar but without success.

If I try to add a calendar, I get an error "ERRORTITLE Failed to save 
changes.: []"

My /var/log/roundcubemail/errors.log  have this php error:

"PHP Error: IMAP server doesn't support METADATA or ANNOTATEMORE (POST 
/roundcubemail/kpicBhedbd4lWi3Z/?_task=calendar&_action=calendar)"

Any idea what I'm missing?

Thank you

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