This stack file doesn’t work on Docker Cloud, despite seeming to be valid. https://github.com/thelounge/docker-lounge/blob/master/docker-compose.yml
The issue seems to be with the
volumes line. Removing it works. The “stack YAML reference” that the error message links to specifies that exact syntax for volumes. https://docs.docker.com/docker-cloud/apps/stack-yaml-reference/#/volumes
I’ve attached a screenshot, if that helps.