为什么一直报错"5个pod有未绑定的即时PersistentVolumeClaims"？

kubectl get pvc
kubectl get pv

kubectl get storageclass

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: example-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
  storageClassName: standard

kubectl get nodes

apiVersion: v1
kind: Pod
metadata:
  name: example-pod
spec:
  containers:
    - name: example-container
      image: nginx
      resources:
        requests:
          memory: "64Mi"
          cpu: "250m"
        limits:
          memory: "128Mi"
          cpu: "500m"
  volumes:
    - name: example-volume
      persistentVolumeClaim:
        claimName: example-pvc

apiVersion: v1
kind: PersistentVolume
metadata:
  name: example-pv
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"

kubectl apply -f example-pv.yaml