iferr!=nil{// if there is no volume there won't be any error
glog.Warningf("error deleting left docker volumes. To see the list of volumes run: 'docker volume ls' \n%v:",err)
glog.Warningf("error deleting left docker volumes. \n%v:\nfor more information please refer to docker documentation: https://docs.docker.com/engine/reference/commandline/volume_prune/",err)