Fixed the error message

[pierluigilenoci]

Is this a bug fix or adding new feature?

Bugfix for #486

What is this PR about? / Why do we need it?

Because the error message now is misleading

What testing is done?

None, just changed the error message string

[k8s-ci-robot]

Hi @pierluigilenoci. Thanks for your PR.

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[pierluigilenoci]

@kbasv could you please take a look?

[kbasv]

/ok-to-test

[kbasv]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kbasv, pierluigilenoci

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