This sub surface is missing its base surface, it cannot be drawn.
My model failed to run. The model run was ok and when i added and removed some fixed window. During the removal warning displaced and run failed. when I reopen the model the following message appears and run was failed.
Error: Surface 182 The space referenced by this surface does not exist, it cannot be drawn.
Error: Surface 181 The space referenced by this surface does not exist, it cannot be drawn.
Error: Sub Surface 83 This sub surface is missing its base surface, it cannot be drawn.
Did you try David's solution in this question that you posted this question as an answer on?