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.