Traefik NOT detected the new container and updated its own configuration

Traefik Traefik v2 (latest)
1

Follow this link to start playing: https://docs.traefik.io/getting-started/quick-start/

version: '3'

services:
  reverse-proxy:
	# The official v2 Traefik docker image
	image: traefik:v2.2
	# Enables the web UI and tells Traefik to listen to docker
	command: --api.insecure=true --providers.docker
	ports:
	  # The HTTP port
	  - "80:80"
	  # The Web UI (enabled by --api.insecure=true)
	  - "8080:8080"
	volumes:
	  # So that Traefik can listen to the Docker events
	  - /var/run/docker.sock:/var/run/docker.sock

  whoami:
	# A container that exposes an API to show its IP address
	image: containous/whoami
	labels:
	  - "traefik.http.routers.whoami.rule=Host(`whoami.docker.localhost`)"

`docker-compose up -d reverse-proxy` docker-compose up -d whoami
$ curl -H Host:whoami.docker.localhost http://127.0.0.1

$ docker-compose up -d reverse-proxy (without whoami in ymlfile)
able to see raw data http://localhost:8080/api/rawdata
able to see dashboard http://localhost:8080/

$ docker-compose up -d whoami
Traefik NOT detected the new container and updated its own configuration.

`curl -H Host:whoami.docker.localhost http://127.0.0.1` curl: (7) Failed to connect to localhost port 80: Connection refused

I found whoami container is running.

Version:      2.2.0
Codename:     chevrotin
Go version:   go1.14.1
Built:        2020-03-25T17:32:57Z
OS/Arch:      linux/amd64

Any help please?