failed to get default registry endpoint from daemon

[MalteToenjes]

Using default tag: latest Warning: failed to get default registry endpoint from daemon (Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?). Using system default: https://index.docker.io/v1/ Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? Failed to run last step!

I got this error