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ApacheSim Error: Surface Index Out of Range on Rooms File 19

It sounds like the model has been changed since you created the shading file in SunCast. When SunCast calculates a shading file for a project it creates shading data for each surface in the model. If these surfaces don't match up with the surfaces described in ModelIT (i.e. the model has changed) then an error will occur. To avoid this problem, recalculate the shading file in SunCast to take account of any model changes before running ApacheSim.