Simplify and clarify an error message

Peter Eisentraut <peter@eisentraut.org>

Commit: 9c4c22fdfeab86a65fdba9d2fe63879c034001ae
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-08-18T09:33:53Z
Releases: 15.0
Simplify and clarify an error message

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