[SOLVED] ERROR: Version in "./docker-compose.yml" is unsupported

ERROR: Version in "./docker-compose.yml" is unsupported

I am running docker-compose build in a folder with the relevant docker files and yml files. I see the following error

root@ubuntu187_demo_2:~/IDOLDockerContainers_12.4.0_COMMON/basic-idol# docker-compose build
ERROR: Version in "./docker-compose.yml" is unsupported. You might be seeing this error because you're using the wrong Compose file version. Either specify a supported version (e.g "2.2" or "3.3") and place your service definitions under the `services` key, or omit the `version` key and place your service definitions at the root of the file to use version 1.
For more on the Compose file format versions, see https://docs.docker.com/compose/compose-file/

The docker-compose.yml is as follows

# Basic IDOL container setup
# Uses nifi to ingest and index data into content
# Uses find to make search results available
# Default admin user is created for find in the community service
#  - see community/run_community.sh for details

version: "3.7"

x-args-shared:
  - &idol-version IDOL_VERSION=12.4.0 # version of IDOL components to use

# Change the IP to the address of an external IDOL LicenseServer instance
x-external-licenseserver-host: &external-licenseserver-host
  - "idol-licenseserver:xx.xx.xx.xx"

# Shared volume configuration for nifi and view service - see volumes
x-idol-ingest-volume: &idol-ingest-volume
  - idol-ingest-volume:/idol-ingest

#x-idol-categorisation-volume: &idol-categorisation-volume
#  - idol-categorisation-volume:/idol-categorisation

# Shared volume in NiFi and View
# Any files dropped into this volume will be ingested and indexed
volumes:
  idol-ingest-volume:
# idol-categorisation-volume:

services:
  idol-content:
    image: idol-compose/content
    build:
      context: ./content
      args:
        - *idol-version
    extra_hosts: *external-licenseserver-host
    ports:
      - 9100:9100

docker-compose version

root@ubuntu18_demo_2:~/IDOLDockerContainers_12.4.0_COMMON/basic-idol# docker-compose -version
docker-compose version 1.17.1, build unknown

docker version

root@ubuntu18_demo_2:~/IDOLDockerContainers_12.4.0_COMMON/basic-idol# docker -v
Docker version 19.03.1, build 74b1e89

I can't change the version on the docker-compose.yml file.

Solution

Your compose is too old, if you cannot change the version in compose, try to upgrade to latest docker-compose version

sudo curl -L "https://github.com/docker/compose/releases/download/1.24.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

Detail refers to this