Blank Page with reverse proxy

this is what I get by trying this procedure

JAIL_NAME:caddy: not found
JAIL_INTERFACES not set, defaulting to: vnet0:bridge0
caddy successfully created!

Stopped caddy due to VNET failure
Failed to create jail

the parameters I entered

JAIL_IP="192.168.1.192"
DEFAULT_GW_IP="192.168.0.254"
POOL_PATH="/mnt/Stockage"
JAIL_NAME:"caddy"

in general when I create jails in command line, this procedure works all the time

iocage create -n nextcloud -r 11.3-RELEASE ip4_addr="vnet0|192.168.0.10/24" defaultrouter="192.168.0.1" vnet="on" allow_raw_sockets="1" boot="on