You have input an Interior Surface that has a very large surface area. In this case, the interior surface are is larger than the sum of all other surfaces in the Zone it is adjacent to. This is not physically possible to have a single surface that is larger than 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 adjacent Zone.
← Error 1099