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you are trying to pass an object of type `aws.ec2.KeyPair` to the `eks.Cluster.nodePublicKey` property, which expects a string.

Option A:
```const cluster = new eks.Cluster(env, {
  ...
  nodePublicKey: "ssh-rsa...",
  ...
})```
Option B:
```const cluster = new eks.Cluster(env, {
  ...
  nodePublicKey: nodePublicKeyPair.nodePublicKey,
  ...
})```