kubernetes does not work properly. throw error "Unknown command line flag 'kubernetes_nodes""

The test runs in Ubutun 16.04. PerfKid version 1.13
kubectl version
Client Version: version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.3", BuildDate:"2017-11-08T18:39:33Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"7+", GitVersion:"v1.7.8-gke.0"

gcloud version
Google Cloud SDK 180.0.1
alpha 2017.09.15
app-engine-python 1.9.63
beta 2017.09.15
bq 2.0.27
core 2017.11.20
gcloud
gsutil 4.28
kubectl
when run perfkid, it shows error does not know kubernetes_nodes

./pkb.py --cloud=Kubernetes --kubectl=/usr/local/bin/kubectl --kubeconfig=~/.kube/config --benchmarks=cluster_boot --machine_type=n1-standard-1 --data_disk_type=local --kubernetes_nodes=35.202.104.19,35.192.52.201,35.202.218.216
ERROR Unknown command line flag 'kubernetes_nodes'. Did you mean: kubernetes_anti_affinity?
INFO For usage instructions, use --helpmatch={module_name}
INFO For example, ./pkb.py --helpmatch=benchmarks.fio