The total area of Interior walls which are adjacent to your Zone is greater than half the total surface area of this zone, which includes both child surfaces and Interior walls and floors which are next to this zone.
This is not physically possible to have a single surface that is larger than half of all other surfaces in a zone, since that zone as a minimum will have ceilings and floors that will prevent this circumstance.
You have either made a mistake in the area of this surface or you have forgotten to input all of the other surfaces in the Zone.
Either reduce the size of this surface, or increase the areas of other surfaces in the Zone.
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