I have done the year update and if I have port 4200 enabled, and this happens to me when I start the server with: prefect server start

What do you get when you

pip freeze | grep anyio

? If you uninstall prefect and reinstall the latest, you should get the correct version of anyio. If not you can try uninstall anyio and manually installing the anyio to a version < 4.0.0

Thanks Jake!!!, I tell you that the solution was to install sqlite