Simplify and clarify an error message

Peter Eisentraut <peter@eisentraut.org>

Commit: 08909e3aee6182a988da5bf5c1b543910ee096c7
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-08-18T09:36:55Z
Releases: 16.0
Simplify and clarify an error message

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