Just installed the beta with Delphi 10.3, no previous installations of either, and I'm getting 'Error: Could not start server" when I try and run it locally. http://localhost:8000/Project1
I've looked at the firewall & I can't think of anything else that might be running.
When you or anyone else find such message, please take a look at the web server window and see if there is an additional message there that provides more info.