Problem installing!

I installed ubuntu 18.04 with plesk control panel on my vps, i then installed snapd and isntalled rocket chat. rocketchat and mongodb started successfully but caddy is failed.
sudo journalctl -f -u snap.rocketchat-server.rocketchat-caddy
snap.rocketchat-server.rocketchat-caddy.service: Main process exited, code=exited, status=1/FAILURE
snap.rocketchat-server.rocketchat-caddy.service: Failed with result ‘exit-code’.
Failed to start Service for snap application rocketchat-server.rocketchat-caddy.

Server Setup Information:

  • Version of Rocket.Chat Server: latest
  • Operating System: Ubuntu 18.04
  • Deployment Method: snapd
  • Number of Running Instances: 1
  • DB Replicaset Oplog: N/A
  • NodeJS Version: N/A
  • MongoDB Version: latest

Any idea?