我正在尝试实现this tutorial。“docker-compose”内容如下：

# WARNING: Do not deploy this tutorial configuration directly to a production environment
#
# The tutorial docker-compose files have not been written for production deployment and will not 
# scale. A proper architecture has been sacrificed to keep the narrative focused on the learning 
# goals, they are just used to deploy everything onto a single Docker machine. All FIWARE components 
# are running at full debug and extra ports have been exposed to allow for direct calls to services. 
# They also contain various obvious security flaws - passwords in plain text, no load balancing,
# no use of HTTPS and so on. 
# 
# This is all to avoid the need of multiple machines, generating certificates, encrypting secrets
# and so on, purely so that a single docker-compose file can be read as an example to build on, 
# not use directly. 
# 
# When deploying to a production environment, please refer to the Helm Repository
# for FIWARE Components in order to scale up to a proper architecture:
# 
# see: https://github.com/FIWARE/helm-charts/
#
version: "3.5"
services:
  # Orion is the context broker
  orion:
    image: fiware/orion:latest
    hostname: orion
    container_name: fiware-orion
    depends_on:
        - mongo-db
    networks:
        - default
    expose:
        - "1026"
    ports:
        - "1026:1026"
    command: -dbhost mongo-db -logLevel DEBUG
    healthcheck:
      test: curl --fail -s http://orion:1026/version || exit 1
      interval: 5s
  # Tutorial displays a web app to manipulate the context directly
  
  tutorial:
    image: fiware/tutorials.context-provider
    hostname: iot-sensors
    container_name: fiware-tutorial
    networks:
        - default
    expose:
        - "3000"
        - "3001"
    ports:
        - "3000:3000"
        - "3001:3001"
    environment:
        - "DEBUG=tutorial:*"
        - "PORT=3000"
        - "IOTA_HTTP_HOST=iot-agent"
        - "IOTA_HTTP_PORT=7896"
        - "DUMMY_DEVICES_PORT=3001"
        - "DUMMY_DEVICES_API_KEY=4jggokgpepnvsb2uv4s40d59ov"
        - "DUMMY_DEVICES_TRANSPORT=HTTP"
  iot-agent:
    image: fiware/iotagent-ul:latest
    hostname: iot-agent
    container_name: fiware-iot-agent
    depends_on:
        - mongo-db
    networks:
        - default
    expose:
        - "4041"
        - "7896"
    ports:
        - "4041:4041"
        - "7896:7896"
    environment:
        - "IOTA_CB_HOST=orion"
        - "IOTA_CB_PORT=1026"
        - "IOTA_NORTH_PORT=4041"
        - "IOTA_REGISTRY_TYPE=mongodb"
        - "IOTA_LOG_LEVEL=DEBUG"
        - "IOTA_TIMESTAMP=true"
        - "IOTA_MONGO_HOST=mongo-db"
        - "IOTA_MONGO_PORT=27017"
        - "IOTA_MONGO_DB=iotagentul"
        - "IOTA_HTTP_PORT=7896"
        - "IOTA_PROVIDER_URL=http://iot-agent:4041"
 # Database
  mongo-db:
    image: mongo:3.6
    hostname: mongo-db
    container_name: db-mongo
    expose:
        - "27017"
    ports:
        - "27017:27017"
    networks:
        - default
    command: --bind_ip_all --smallfiles
    volumes:
      - mongo-db:/data
    healthcheck:
      test: |
        host=`hostname --ip-address || echo '127.0.0.1'`; 
        mongo --quiet $host/test --eval 'quit(db.runCommand({ ping: 1 }).ok ? 0 : 2)' && echo 0 || echo 1
      interval: 5s
      
networks:
  default:
    ipam:
      config:
        - subnet: 172.18.1.0/24
volumes:
  mongo-db: ~

但是当我用命令“docker-compose up -d”运行docker compose时，我得到了这个错误：

*WARNING: The host variable is not set. Defaulting to a blank string.
Creating network "fiware_default" with the default driver
ERROR: Pool overlaps with other one on this address space*

我也可以通过运行命令“docker network ls”来获取这些网络：

*NETWORK ID     NAME            DRIVER    SCOPE
78403834b9bd   bridge          bridge    local
1dc5b7d0534b   hadig_default   bridge    local
4162244c37b0   host            host      local
ac5a94a89bde   none            null      local*

我看不出与名称“fiware_default”有冲突。问题出在哪里？