Cannot connect to the Docker daemon at unix:///var/run/docker.sock. -- Error

zouz@zouz:~$ docker -vDocker version 20.10.8, build 3967b7d28ezouz@zouz:~$ sudo docker infoClient: Context:    default Debug Mode: falseServer:ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?errors pretty printing info

and everytime i run docker i get this error.Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

help is appreciated.