Fix error naming convention

[josedonizetti]

Enforcing a convention of ever error starting with lowercase.

[k8s-ci-robot]

Hi @josedonizetti. Thanks for your PR.

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[minikube-bot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: josedonizetti
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[medyagh]

Looks good to me