Github action jobs error when push branch is specified

I am trying to trigger my pipeline on develop branch.

This code works :

name: develop

on: [push]
  jobs:
    build:

      runs-on: ubuntu-latest

      steps:
      - uses: actions/checkout@v1
      - name: set up JDK 1.8
        uses: actions/setup-java@v1
        with:
          java-version: 1.8
      - name: Build Debug version
        run: |
            chmod +x pipelines.sh
            ./pipelines.sh "build"

This code does not works :

name: develop

on: 
  push:
    branches:    
      - 'develop'
  jobs:
    build:

      runs-on: ubuntu-latest

      steps:
      - uses: actions/checkout@v1
      - name: set up JDK 1.8
        uses: actions/setup-java@v1
        with:
          java-version: 1.8
      - name: Build Debug version
        run: |
            chmod +x pipelines.sh
            ./pipelines.sh "build"

I have always this error message :

jobs is not a valid event name

How must i format my file to make it works ?