Installation on LXC error 503

Hello, i have installed succefully on Proxmox, under ubuntu 22.04.
At the end of the install, before rebooting, the panel works fine, but after rebooting, i have the 503 error.

LSCPD Daemon, and LSWS are launched, and online.

LXC have 16G Ram, 100G disk.

LXC is nest=on.

Why i have this 503 error?

Thank you.

Where you able to resolve this?

Checking to know if you got this resolved.