Kubelet and apiserver and controller manager have enabled VolumeAttributesClass，wjhy still no VolumeAttributesClass resources？

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ExecStart=/opt/kube/bin/kube-apiserver \
  --feature-gates=VolumeAttributesClass=true \
  --allow-privileged=true \
  --anonymous-auth=false \
  --api-audiences=api,istio-ca \
  --authorization-mode=Node,RBAC \
  --bind-address=192.168.229.159 \
  --client-ca-file=/etc/kubernetes/ssl/ca.pem \
  --endpoint-reconciler-type=lease \
  --etcd-cafile=/etc/kubernetes/ssl/ca.pem \
  --etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem \
  --etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem \
  --etcd-servers=https://192.168.229.159:2379,https://192.168.229.160:2379,https://192.168.229.161:2379 \
  --kubelet-certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --kubelet-client-certificate=/etc/kubernetes/ssl/kubernetes.pem \
  --kubelet-client-key=/etc/kubernetes/ssl/kubernetes-key.pem \
  --secure-port=6443 \
  --service-account-issuer=https://kubernetes.default.svc \
  --service-account-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
  --service-account-key-file=/etc/kubernetes/ssl/ca.pem \
  --service-cluster-ip-range=10.81.0.0/16 \
  --service-node-port-range=30000-32767 \
  --tls-cert-file=/etc/kubernetes/ssl/kubernetes.pem \
  --tls-private-key-file=/etc/kubernetes/ssl/kubernetes-key.pem \
  --requestheader-client-ca-file=/etc/kubernetes/ssl/ca.pem \
  --requestheader-allowed-names= \
  --requestheader-extra-headers-prefix=X-Remote-Extra- \
  --requestheader-group-headers=X-Remote-Group \
  --requestheader-username-headers=X-Remote-User \
  --proxy-client-cert-file=/etc/kubernetes/ssl/aggregator-proxy.pem \
  --proxy-client-key-file=/etc/kubernetes/ssl/aggregator-proxy-key.pem \
  --enable-aggregator-routing=true \
  --v=2

root@29-b:~# kubectl get VolumeAttributesClass
error: the server doesn’t have a resource type “VolumeAttributesClass”