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I am using OpenStudio Application and would like to add Exterior Lights. Unfortunately, the "+" down in the right hand corner to initiate exterior lights is grey, not green, and not active. How do I turn the "+" from grey to green?

I am using OpenStudio Application and would like to add Exterior Lights. Unfortunately, the "+" down in the right hand corner to initiate exterior lights is grey, not green, and not active. How do I turn the "+" from grey to green?