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

　　k8s使用kubectl出现以下错误

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1	kubectl get cs

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

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./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，版本不对，使用低一点版本k8s例如1.17.4