Calendarserver : bad; vendor preset: enabled)

Hello,

Here is my configuration
ubuntu 16.04 LTS 64 bit
package version :
python 2.7.11-1
calendarserver 7.0-dfsg-2

My objective : to make the calenarserver running

My problem :

When I enter this command in a terminal :

systemctl status calendarserver.service
● calendarserver.service - LSB: Calendar and Contacts Server
   Loaded: loaded (/etc/init.d/calendarserver; bad; vendor preset: enabled)
   Active: active (exited) since mer. 2016-04-20 10:57:58 CEST; 10h ago
     Docs: man:systemd-sysv-generator(8)
  Process: 1545 ExecStart=/etc/init.d/calendarserver start (code=exited, status=
    Tasks: 0 (limit: 512)

Warning: Journal has been rotated since unit was started. Log output is incomple

why is there the message ; "bad; vendor preset: enabled)"

Could you help me please ?

Best regards

Battant