I followed the official tutorial to install the system. As a beginner, this is my first time encountering such technology. After connecting a monitor, the system displays this prompt. However, I can successfully log in to the web interface. Could you please explain the reason behind this situation and suggest a possible solution?
If I am reading your question correctly, you want to know what the error means.
I don’t know- I’ve never seen this. But since you say that you can use a browser to open homeassistant.local, look at the Supervisor logs for any errors there.
Your issue is network related. Most likely DHCP issue; your system cannot see your router/dhcp-server. Check system is wired to your LAN with a flashing status light (i.e. you are connected to your LAN with signalling not being an issue).
Consult this guide in case you have possibly missed a step or two.
I have never seen a more complex and confusing method of installing Home Assistant:
Cloudflare → x86-64 → Ventoy → Proxmox VE → Pi-hole → Traefik → HAOS
I like, as described in the Home Assistant docs:
x86-64 → HAOS
The OP’s problem could be network related, but the error message is too ambiguous to say so.