TASK [traefik : enable traefik] fails

When launching appolo on digital ocean the task TASK [traefik : enable traefik] fails:

output:

fatal: [apollo-mesos-agent-0]: FAILED! => {"changed": false, "failed": true, "msg": "Job for traefik.service failed because the control process exited with error code. See \"systemctl status traefik.service\" and \"journalctl -xe\" for details.\n"}