Helm install ray cluster on kubernetes error2

According to the document, I download charts from github and install Ray Cluster with below command

helm install example-cluster ./ray -n ray

However, an error appears.

Error: rendered manifests contain a resource that already exists. Unable to continue with install: could not get information about the resource: Get https://myipaddr:6443/apis/cluster.ray.io/v1/namespaces/ray/rayclusters/example-cluster: stream error: stream ID 93; INTERNAL_ERROR

CRD just created after helm install.

kubectl get crd
rayclusters.cluster.ray.io 2021-10-12T08:14:05Z

Delete this crd will cause kubernetes unavailable.

kubectl get nodes
The connection to the server myipaddr:6443 was refused - did you specify the right host or port?

I’m extremely confusing and stuck in this matter several days. Anyone can help me ?