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What does it mean when that icon shows up over a building, usually it's woodcutter or manufacturer of some kind.
This question / problem has been solved by SlaxVice86image
It's been years since I've last played S VI, but could it be that they're hungry?
If the apple has a yellowish tint around it, it means that they are very hungry. A red colour indicates that they are near starvation.

Simply give them something to eat! They'll thank you. :)