error starting on macOS

[f3r3nc]

macOS version: 10.13.3
docker version: Docker version 18.03.1-ce
docker-compose.yml:

version: "3"

services:
  crontab:
    image: willfarrell/crontab
    container_name: cron
    volumes:
     - "/var/run/docker.sock:/var/run/docker.sock:ro"
     - "./config.json:/opt/crontab/config.json:rw"

docker logs cron gives

addgroup: gid '0' in use

on local machine

lrwxr-xr-x  1 root  daemon    58B Apr 26 21:55 /var/run/docker.sock -> /Users/...

When using the actual socket instead of the symlink the error is still there.

[willfarrell]

Sorry, this took so long. v0.4.0 building now.