(已解決)ERROR: In file './docker-compose.yml', service 'networks' must be a mapping not an array

如題錯誤一般是docker-compose.yml的空格縮進問題導致，例如：

version: "3.0"

services:
  web:
    build: .
    ports:
      - "5000:5000"
  networks:  # 縮進不對
      - basic

  redis:
    image: "redis:alpine"
    networks:
      - basic

networks:
  basic: