Grafana.service: Failed with result 'exit-code'

im sorry, can u help me to fix this. im installing on ubuntu 16.04

● grafana.service - Starts and stops a single grafana instance on this system
Loaded: loaded (/lib/systemd/system/grafana.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Jum 2020-01-24 09:45:22 +08; 1min 29s ago
Docs: http://docs.grafana.org
Process: 11999 ExecStart=/usr/sbin/grafana --config={CONF_FILE} cfg:default.paths.logs={LOG_DIR} cfg:default.paths.data=${DATA_DIR} (code=exited, status=1/FAILURE)
Main PID: 11999 (code=exited, status=1/FAILURE)

Jan 24 09:45:22 sigma-virtual-machine systemd[1]: Started Starts and stops a single grafana instance on this system.
Jan 24 09:45:22 sigma-virtual-machine systemd[1]: grafana.service: Main process exited, code=exited, status=1/FAILURE
Jan 24 09:45:22 sigma-virtual-machine systemd[1]: grafana.service: Unit entered failed state.
Jan 24 09:45:22 sigma-virtual-machine systemd[1]: grafana.service: Failed with result ‘exit-code’.