k8s出現error: no configuration has been provided, try setting KUBERNETES_MASTER environment variable

　　k8s使用kubectl出現以下錯誤

kubectl get cs

error: no configuration has been provided, try setting KUBERNETES_MASTER environment variable
　　

./kubectl version
error: Missing or incomplete configuration info.  Please point to an existing, complete config file:

  1. Via the command-line flag --kubeconfig
  2. Via the KUBECONFIG environment variable
  3. In your home directory as ~/.kube/config

 　　原因：使用了k8s18.0的版本，版本不對，使用低一點版本k8s例如1.17.4