Error from server (ServiceUnavailable): the server is currently unable to handle the request

RKE version:
Server Version: version.Info{Major:“1”, Minor:“14”

Docker version: (docker version,docker info preferred)
Version: 18.09.2
Operating system and kernel: (cat /etc/os-release, uname -r preferred)
NAME=“Red Hat Enterprise Linux Server”
VERSION=“7.8 (Maipo)”
Type/provider of hosts: (VirtualBox/Bare-metal/AWS/GCE/DO)
VM-VMware
cluster.yml file:
nodes:

address: 10.xx.xx.xx# NOTE - this is the master node for the rebuilt cluster, where all the configs are
role:
    controlplane
    etcd
    hostname_override: "xxx"
    user: root
address: 10.xx.xx,xx
role:
    controlplane
    etcd
    hostname_override: "xxx"
    user: root
address: 10.xx.xx.xx
role:
    controlplane
    etcd
    hostname_override: "xxx"
    user: root
address: 10.xxx.xx.xx
role:
    worker
    hostname_override: "xxx"
    user: root
address: 10.xx.xx,xx
role:
    controlplane
    etcd
    hostname_override: "xxx"
    user: root
address: 10.xx.xx,xx
role:
    controlplane
    etcd
    hostname_override: "xxx"
    user: root
address: 10.xx.xx,xx
role:
    controlplane
    etcd
    hostname_override: "xxx"
    user: root
    etcd:

snapshot: true
retention: “24h”
creation: “4h0s”

backup_config:
interval_hours: 4
retention: 6

network:
plugin: canal
options: {}
authentication:
strategy: x509
options: {}
sans: []
ssh_key_path: /root/.ssh/id_rsa
#ssh_agent_auth: false
ssh_agent_auth: true
authorization:
mode: rbac
options: {}
ignore_docker_version: true
#kubernetes_version: “v1.12.4-rancher1-1”
private_registries:

url: docker.xxx.xxxx.com
is_default: true
ingress:
provider: "nginx"
options:
ssl-protocols: TLSv1.2
node_selector:
app: ingress
extra_args: {}