Modern front-end development for Rails, second edition - Struggling to get the first chapter to work

After running /bin/setup, the first error was: The foreman' command exists in these Ruby versions: That was easy to fix: gem install foreman`

Then 2 more:
/bin/sh: tailwindcss: command not found
/bin/sh: esbuild: command not found
Fixed with yarn add tailwindcss and yarn add esbuild

Then bin/dev lead to new troubles: ActionController::RoutingError (No route matches [POST] "/rails/live/reload")
Looking at localhost:3000, I see that Rails is running, but I don’t see the app.

What could be wrong here?