invalid_string_cluster_entry

apiVersion: v1
clusters:
- String
contexts:
- context:
    cluster: arn:aws:eks:us-west-2:111222333444:cluster/Existing
    user: arn:aws:eks:us-west-2:111222333444:cluster/Existing
  name: arn:aws:eks:us-west-2:111222333444:cluster/Existing
current-context: arn:aws:eks:us-west-2:111222333444:cluster/Existing
kind: Config
preferences: {}
users:
- name: arn:aws:eks:us-west-2:111222333444:cluster/Existing
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1beta1
      args:
      - --region
      - us-west-2
      - eks
      - get-token
      - --cluster-name
      - Existing
      command: aws