What does "upgrade required" mean?

Hello! I am trying to make a websocket chat, and for some reason, when I run the program, it says "Upgrade Required" in the HTML window. Is there a solution to this?

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"Upgrade Required" is often shown when a request is made over HTTP which needs to be converted into a WebSocket connection ("upgrading").

how do i do that

This means there's one of two problems; either you've created a WebSoket server and are trying to connect to it by visiting it in a browser (doesn't work, browser expects HTML or other plain content) or haven't created a regular HTTP server for the root endpoint.

If it's the former, you should only connect to your server using a WebSocket client, such as the WebSocket interface in JavaScript.

If you want to be able to see the webpage on the homepage in a browser, look up a tutorial for your language and framework for a hybrid HTTP-WebSocket server.

it means you are using an outdated version, and you need an upgrade for it, to use it properly.