causeway-app-referenceapp /docker-compose.yml needs tweaks

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/
jrade@DEXXXLPW02R94L:/mnt/c/data/github/causeway-app-referenceapp$ docker-compose up
Creating network "causeway-app-referenceapp_default" with the default driver
Pulling primary (apachecauseway/demo-wicket-jdo:latest)...
ERROR: The image for the service you're trying to recreate has been removed. If you continue, volume data could be lost. Consider backing up your data before continuing.