Hey @clccode,
Copying my respsonse from another post since I think this might be the same issue.
Could you check if your console says something like:
retrotech@1.0.0 start
node server.js
connected on port 8000
? If that the server is running, also try the shortcut key cmd+s (mac) or ctrl+s (windows) to run the code. I had this issue when testing just then but did a browser refresh, initialised the connection to the server again and seems to be working now.