virtualService add delegate no healthy upstreams

Networking
1 
[root@master01 virtualservice]# kubectl get vs bookinfo -o yaml -n istio
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"networking.istio.io/v1beta1","kind":"VirtualService","metadata":{"annotations":{},"name":"bookinfo","namespace":"istio"},"spec":{"exportTo":["*"],"gateways":["bookinfo-gateway"],"hosts":["*"],"http":[{"delegate":{"name":"productpage","namespace":"istio"},"match":[{"uri":{"exact":"/productpage"}},{"uri":{"prefix":"/static"}},{"uri":{"exact":"/login"}},{"uri":{"exact":"/logout"}},{"uri":{"prefix":"/api/v1/products"}}]}]}}
  creationTimestamp: "2020-07-02T04:50:17Z"
  generation: 15
  name: bookinfo
  namespace: istio
  resourceVersion: "2685002"
  selfLink: /apis/networking.istio.io/v1beta1/namespaces/istio/virtualservices/bookinfo
  uid: 1c02e129-66c0-4f5e-bc14-a0c1bca400c6
spec:
  exportTo:
  - '*'
  gateways:
  - bookinfo-gateway
  hosts:
  - '*'
  http:
  - delegate:
      name: productpage
      namespace: istio
    match:
    - uri:
        exact: /productpage
    - uri:
        prefix: /static
    - uri:
        exact: /login
    - uri:
        exact: /logout
    - uri:
        prefix: /api/v1/products
[root@master01 virtualservice]# kubectl get vs -n istio
NAME          GATEWAYS             HOSTS           AGE
bookinfo      [bookinfo-gateway]   [*]             2d1h
details                            [details]       23h
productpage                        [productpage]   23h
ratings                            [ratings]       23h
reviews                            [reviews]       23h

no healthy upstreams

[root@master01 virtualservice]# istioctl version --remote
client version: 1.6.1
control plane version: 1.6.1
data plane version: 1.6.1 (14 proxies)