Prometheus Error scraping skydns

kube-dns.yaml

apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    kubernetes.io/name: "KubeDNS"
  annotations:
    prometheus.io/scrape: 'true'
    prometheus.io/port: '8888'
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: 10.100.0.10
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP
  - name: metrics
    port: 8888
    protocol: TCP

prometheus.yaml

global:
  scrape_interval: 15s
  evaluation_interval: 15s
scrape_configs:
- job_name: 'skydns'
  scheme: http
  kubernetes_sd_configs:
  - api_servers:
    - 'https://kubernetes.default.svc'
    role: service
    in_cluster: true
    tls_config:
      ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      insecure_skip_verify: true
    bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
  metrics_path: /metrics
  relabel_configs:
  - source_labels: [__meta_kubernetes_service_name]
    action: keep
    regex: kube-dns
  - action: labelmap
    regex: __meta_kubernetes_service_label_(.+)