I have installed K8S cluster via Rancher and it is up and running except:

Looking into the log, it says:

W0414 09:19:00.301391       9 flags.go:221] SSL certificate chain completion is disabled (--enable-ssl-chain-completion=false)
nginx version: openresty/1.15.8.1
W0414 09:19:00.305182       9 client_config.go:541] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
I0414 09:19:00.305528       9 main.go:183] Creating API client for https://10.43.0.1:443
I0414 09:19:00.313466       9 main.go:227] Running in Kubernetes cluster version v1.17 (v1.17.4) - git (clean) commit 8d8aa39598534325ad77120c120a22b3a990b5ea - platform linux/amd64
I0414 09:19:00.318605       9 main.go:91] Validated ingress-nginx/default-http-backend as the default backend.
I0414 09:19:00.604027       9 main.go:102] Created fake certificate with PemFileName: /etc/ingress-controller/ssl/default-fake-certificate.pem
I0414 09:19:00.657480       9 nginx.go:274] Starting NGINX Ingress controller
I0414 09:19:00.692928       9 event.go:258] Event(v1.ObjectReference{Kind:"ConfigMap", Namespace:"ingress-nginx", Name:"nginx-configuration", UID:"5d7200c0-88cc-4b9e-97a3-e28e2a529970", APIVersion:"v1", ResourceVersion:"660", FieldPath:""}): type: 'Normal' reason: 'CREATE' ConfigMap ingress-nginx/nginx-configuration
I0414 09:19:00.696624       9 event.go:258] Event(v1.ObjectReference{Kind:"ConfigMap", Namespace:"ingress-nginx", Name:"udp-services", UID:"8d6491ff-b617-4b01-b318-d4afd66cdb1f", APIVersion:"v1", ResourceVersion:"662", FieldPath:""}): type: 'Normal' reason: 'CREATE' ConfigMap ingress-nginx/udp-services
I0414 09:19:00.696864       9 event.go:258] Event(v1.ObjectReference{Kind:"ConfigMap", Namespace:"ingress-nginx", Name:"tcp-services", UID:"4ded14e4-6669-49de-89e6-f15007751014", APIVersion:"v1", ResourceVersion:"661", FieldPath:""}): type: 'Normal' reason: 'CREATE' ConfigMap ingress-nginx/tcp-services
I0414 09:19:01.858339       9 nginx.go:318] Starting NGINX process
I0414 09:19:01.858724       9 leaderelection.go:235] attempting to acquire leader lease  ingress-nginx/ingress-controller-leader-nginx...
I0414 09:19:01.859332       9 controller.go:133] Configuration changes detected, backend reload required.
I0414 09:19:01.862863       9 status.go:86] new leader elected: nginx-ingress-controller-28k5x
E0414 09:19:01.912314       9 controller.go:145] Unexpected failure reloading the backend:
-------------------------------------------------------------------------------
Error: exit status 1
nginx: the configuration file /tmp/nginx-cfg115117149 syntax is ok
2020/04/14 09:19:01 [emerg] 41#41: bind() to 0.0.0.0:80 failed (13: Permission denied)
nginx: [emerg] bind() to 0.0.0.0:80 failed (13: Permission denied)
nginx: configuration file /tmp/nginx-cfg115117149 test failed

What am I doing wrong?