Clone this repo and run
bin/console server:run and open
http://127.0.0.1:8000/ in a browser
You should see the folloging error:
Controller "App\Controller\DefaultController::index()" requires that you provide a value for the "$service" argument. Either the argument is nullable and no null value has been provided, no default value has been provided or because there is a non optional argument after this one.
If you comment out the content of
config/services_dev.yaml, the error disappears.