docker version

[lmatz]

In the ad-ctr tutorial,

docker-compose up -d
ERROR: The Compose file './docker-compose.yml' is invalid because:
'name' does not match any of the regexes: '^x-'
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/

See the issue at docker/compose#9412

We may need to either remind users of the docker's version or ask users to enable "Use Docker Compose V2" in Docker Desktop to fix the problem.