docker-compose up -d失败

docker-compose.yml

version: "2"
services:
  DOClever:
    image: lw96/doclever
    restart: always
    container_name: "DOClever"
    ports:
    - 20080:10000
    volumes:
    - /srv/doclever/file:/root/DOClever/data/file
    - /srv/doclever/img:/root/DOClever/data/img
    - /srv/doclever/tmp:/root/DOClever/data/tmp
    environment:
    - DB_HOST=mongodb://mongo:27017/DOClever
    - PORT=10000
    links:
    - mongo:mongo

  mongo:
    image: mongo:latest
    restart: always
    container_name: "mongodb"
    volumes:
    - /usr/local/resource/mongodb:/data/db

显示错误为：

ERROR: In file './docker-compose.yml', the service name True must be a quoted string, i.e. 'True'.

docker版本为19.03 docker-compose版本为1.24.1

请问老师此处如何解决，敬谢指导！