contacts not synchronized on mac 10.10.5

[agreif]

Hi,

contacts are not synchronized in either way.
no contacts fetched from server (contacts created on server dont show up on client)
no contacts pushed from client (contacts created on client dont show up on server)

I installed:
owncloud 8.1.3 (php 5.6)
database is postgresql-server-9.4.4p1
contanstplus (zip from 4. okt. 2015)
Mac OS X 10.10.5

original 'contacts' app is deactivated

Mac Contacts app does not show any errors or warnings

In the owncloud.log I get these errors every few minutes:

{"reqId":"lTOItZJub9j5eQywjdoR","remoteAddr":"...","app":"PHP","message":"Undefined variable: calendarobjects at /owncloud_docroot/apps/calendarplus/lib/alarm.php#191","level":3,"time":"2015-10-04T09:09:54+00:00"}
{"reqId":"lTOItZJub9j5eQywjdoR","remoteAddr":"...","app":"PHP","message":"Undefined variable: calendarobjects at /owncloud_docroot/apps/calendarplus/lib/alarm.php#191","level":3,"time":"2015-10-04T09:09:54+00:00"}

Alex.

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