Unify some error messages

Peter Eisentraut <peter@eisentraut.org>

Commit: dca20013ebab0f0176e610a36b846d899af1d451
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2023-08-16T14:17:00Z
Releases: 17.0
Unify some error messages

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

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