Someone else reported that bug. Looks like it hasn't been fixed yet.
When I think the message is supposed to appear, is for example, when you try to call a new stake YM president, but you haven't released the old one. (Can't have two stake YM presidents). But for some reason, sometimes it's getting triggered by updating the setting apart.
Best thing to do in this case is to contact support. They can document the problem and pass it on to the developers.
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