Linter: cyclical step dependency detected

hello all ,
https://blog.drone.io/drone-1/

i am following this blog in this blog their is a example for faster pipe line utilization
so whenever i am trying to do that i am getting error as suggested in topic

here is my .yml file
kind: pipeline
name: default

steps:

  • name: frontend
    image: golang
    commands:

    • go build
  • name: backend
    image: node
    command:

    • npm install

    depends_on:

    • frontend
    • backend

here is my docker commnd:-
docker run --volume=/var/run/docker.sock:/var/run/docker.sock --volume=/var/lib/drone:/data --env=DRONE_GITHUB_SERVER=https://github.com --env=DRONE_GITHUB_CLIENT_ID=xxx–env=DRONE_GITHUB_CLIENT_SECRET=xxx --env=DRONE_RUNNER_CAPACITY=2 --env=DRONE_SERVER_HOST=xxx --env=DRONE_SERVER_PROTO=https --env=DRONE_TLS_AUTOCERT=true --publish=80:80 --publish=443:443 --restart=always --detach=true --name=dronedump drone/drone:1

problem is solved

i am placing depend_on key word at wrong place it should be after slacknotification command