always pops up in the output panel  "Httperror: "

HttpError would mean that the game fails to send a HTTP request to gmlive-server or get a response.

You could run the server with --port 5101 (or any other number) from Command Prompt or Powershell and change the port in obj_gmlive’s Create event.

If you have an aggressive antivirus/firewall, you may have to whitelist the server there.

Yes, it even works in 2022.6[00]. It only doesn’t supports time_sources.

I solved the problem, and all that remains is to learn how to use it. Thank you very much