Mattermost start failed

Hello,
Yesterday my server with mattermost work correctly. I do not restart it or doing update and today when I try to connect via windows app I have information: Error: ERR_ABORTED (-3) loading ‘http://mattermost…’

Log from mattermost.service say:

mattermost.service: Failed to load environment files: No such file or directory
mattermost systemd[1]: mattermost.service: Failed to run ‘start’ task: No such file or directory
mattermost systemd[1]: mattermost.service: Failed with result ‘resources’.
mattermost systemd[1]: Failed to start Mattermost.

Don’t know what is going on.

Hi Matheo and welcome to the Mattermost forums!

Please verify that no Mattermost process is running at the moment:

ps ax | grep mattermost

(should not return any running process).
If there is one and your Mattermost service is offline at the moment, then please kill this process or restart your server.

Next please verify, that the systemd unit is fully stopped and all run files are clread:

systemctl stop mattermost

If you are unable to start Mattermost then using systemctl start mattermost, please provide the output of the following command (which is the last 100 lines of the logfile):

tail -100 /opt/mattermost/logs/mattermost.log

as well as the output of:

systemctl status mattermost