docker-compose 할 때 ERROR: Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running? 에러

docker 데몬은 떠있어요.
docker-compose로 프로그램을 깔려고 하는데..


ERROR: Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running?


에러가 나는데 뭘 확인해보면 좋을까요~