Yarn start localhost is not reachable

I cannot even start dev localhost on my window 10.

I just followed the documentation

composer create-project roots/sage your-theme-name
yarn install
yarn start

node -v

  "entry": {
    "main": [
    "customizer": [
  "publicPath": "/app/themes/sage/infinity",
  "devUrl": "http://infinity.dev",
  "proxyUrl": "http://localhost:3000",
  "cacheBusting": "[name]_[hash:8]",
  "watch": [

localhost:3001 works which are for browser sync panel.
What else should I share with you guys so that you guys can see which one is wrong?

Does it suppose to work without virtual env like docker or vagrant?

No, you need to have a working development environment before Sage’s browsersync will work. We recommend using Trellis.

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