运行时docker-compose up，出现此错误：

root@ubuntu:/home/benson/Docker/HaproxyMy# docker-compose up
Recreating 950ddc308278_950ddc308278_950ddc308278_950ddc308278_950ddc308278_haproxymy_webb_1
Recreating 485800bdf3a1_485800bdf3a1_485800bdf3a1_485800bdf3a1_485800bdf3a1_haproxymy_webc_1
Recreating 2b3338d88716_2b3338d88716_2b3338d88716_2b3338d88716_2b3338d88716_haproxymy_weba_1

ERROR: for webb  No such image: sha256:15853e771e7ca3f5eecee38fcf97efd3ee164c1b66e2ef543d9985a04e78e099

ERROR: for webc  No such image: sha256:15853e771e7ca3f5eecee38fcf97efd3ee164c1b66e2ef543d9985a04e78e099

ERROR: for weba  No such image: sha256:15853e771e7ca3f5eecee38fcf97efd3ee164c1b66e2ef543d9985a04e78e099

docker-compose.yml：

weba:
    build: ./web
    expose:
        - 80

webb:
    build: ./web
    expose:
        - 80

webc:
    build: ./web
    expose:
        - 80


haproxy:

    image: haproxy:latest

    volumes:

        - ./haproxy:/haproxy-override
        - ./haproxy/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro
    links:

        - weba
        - webb
        - webc
    ports:

        - "80:80"
        - "70:70"
    expose:

        - "80"
        - "70"