Frontend won't start, gives 502: Bad Gateway

I installed HAOS on a miniPC, ECS Liva Z3 plus, and put in MQTT broker and Zigbee2MQTT, i put frondend: True in YAML.
The Adds-on MQTT and Zigbee2MQTT ar running.
When i hit Web UI of Zigbee2MQTT in the sidebar, it says;
image
Then endless askes me to try again.
On top left corner it says 502: Bad Gateway.
How can i fix this?

Solved
data_path: /config/zigbee2mqtt
socat:
enabled: false
master: pty,raw,echo=0,link=/tmp/ttyZ2M,mode=777
slave: tcp-listen:8485,keepalive,nodelay,reuseaddr,keepidle=1,keepintvl=1,keepcnt=5
options: “-d -d”
log: false
mqtt:
server: mqtt://core-mosquitto:1883
user: Me
Password: My Password
serial:
port: >-
/dev/serial/by-id/usb-Itead_Sonoff_Zigbee_3.0_USB_Dongle_Plus_V2_5841e0b6520eef11a278be2a433abf1e-if00-port0
adapter: ezsp (I may be needed to flash to ember, don’t know how)
frontend: true
port: 8099
warning: zh:ezsp: ‘ezsp’ driver is deprecated and will only remain to provide support for older firmware (pre 7.4.x). Migration to ‘ember’ is recommended. If using Zigbee2MQTT see
https://github.com/Koenkk/zigbee2mqtt/discussions/21462

Change that to

frontend: true

Worked whole day, and now the problem is back :frowning:
Removed the lines in Zigbee2MQTT at mqtt: saved, and its running again