It is throwing error while connecting aks cluster with dynatrace

kubectl create namespace dynatrace
Error from server (InternalError): Internal error occurred: failed calling webhook “rancher.cattle.io.namespaces.create-non-kubesystem”: failed to call webhook: Post “https://rancher-webhook.cattle-system.svc:443/v1/webhook/validation/namespaces?timeout=10s”: service “rancher-webhook” not found Is it throwing error beacuse of namespace cattle-system which we have created earlier