Error executing docker run --name photon -d -v $PWD/jekyll:/home/jenkins -p 4000:4000 praqma/gh-pages || docker start photon

[ghost]

docker: invalid reference format.
See 'docker run --help'.
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.39/containers/photon/start: dial unix /var/run/docker.sock: connect: permission denied
Error: failed to start containers: photon