Unify some error messages

Peter Eisentraut <peter@eisentraut.org>

Commit: c672262779833a6b58cf5a4e85a9b76efd660cb7
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2023-08-16T14:18:49Z
Releases: 16.0
Unify some error messages

We had essentially the same error in several different wordings.
Unify that.

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