Start MM via systemd ubuntu 16.04

Hi There,

Today I started the installation of mattermost on Ubuntu 16.04, since Ubuntu 16.04 is using systemd instead of init I need to create a script that can start up MM on boot.

This is what I got so far:

[Unit]
Description=Starting Mattermost -

[Service]
Type=oneshot
ExecStart=/opt/mattermost/bin/platform
ExecStop=/bin/kill -9 $MAINPID

[Install]
WantedBy=multi-user.target

When running "systemctl start mattermost.service" I get the following output:

mattermost.service - Starting Mattermost -
Loaded: loaded (/lib/systemd/system/mattermost.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Wed 2016-05-18 12:24:55 UTC; 12s ago
Process: 8785 ExecStart=/opt/mattermost/bin/platform (code=exited, status=2)
Main PID: 8785 (code=exited, status=2)

May 18 12:24:55 bergpolder platform 0x4)
May 18 12:24:55 bergpolder platform +0x2ee
May 18 12:24:55 bergpolder platformMay 18 12:24:55 bergpolder platform +0x2c
May 18 12:24:55 bergpolder platform8785: main.main()
May 18 12:24:55 bergpolder platform +0x2c
May 18 12:24:55 bergpolder systemd[1]: mattermost.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
May 18 12:24:55 bergpolder systemd[1]: Failed to start Starting Mattermost -:).
May 18 12:24:55 bergpolder systemd[1]: mattermost.service: Unit entered failed state.
May 18 12:24:55 bergpolder systemd[1]: mattermost.service: Failed with result 'exit-code'.

How can I solve this?

Cheers!