rocketchat does not work after reboot?

I have just install a rocketchat app form marketplace on digitalocean. After reboot the droplet I get this site cant be reached error.

I check the service;

service rocketchat status ● rocketchat.service - The Rocket.Chat server Loaded: loaded (/lib/systemd/system/rocketchat.service; enabled; vendor preset: enabled) Active: active (running) since Tue 2021-02-23 00:13:26 UTC; 3min 21s ago Main PID: 1362 (node) Tasks: 10 (limit: 1151) CGroup: /system.slice/rocketchat.service └─1362 /usr/bin/node /opt/Rocket.Chat/main.js

And also it says degraded ??;

rocketchat-ubuntu-s-1vcpu-1gb-sfo3-01 State: degraded Jobs: 0 queued Failed: 1 units Since: Tue 2021-02-23 00:07:36 UTC; 17min ago CGroup: / ├─user.slice │ └─user-0.slice │ ├─session-1.scope │ │ ├─1117 sshd: root@pts/0 │ │ ├─1249 -bash │ │ ├─2409 systemctl status │ │ └─2410 systemctl status │ └─user@0.service │ └─init.scope │ ├─1127 /lib/systemd/systemd --user │ └─1128 (sd-pam) ├─init.scope │ └─1 /sbin/init └─system.slice ├─systemd-networkd.service │ └─676 /lib/systemd/systemd-networkd ├─systemd-udevd.service │ └─759 /lib/systemd/systemd-udevd ├─cron.service │ └─861 /usr/sbin/cron -f ├─system-serial\x2dgetty.slice │ └─serial-getty@ttyS0.service │ └─877 /sbin/agetty -o -p – \u --keep-baud 115200,38400,9600 ttyS0 vt220 ├─nginx.service │ ├─1627 nginx: master process /usr/sbin/nginx -g daemon on; master_process on; │ └─1630 nginx: worker process ├─polkit.service │ └─875 /usr/lib/policykit-1/polkitd --no-debug ├─networkd-dispatcher.service │ └─859 /usr/bin/python3 /usr/bin/networkd-dispatcher --run-startup-triggers ├─accounts-daemon.service │ └─841 /usr/lib/accountsservice/accounts-daemon ├─systemd-journald.service

Any idea would be appreciated, thanks…