The CBECC Com simulation only supports a construction assembly with one framed layer, multiple layers with framing are not supported. If you wish to approximate the second framed layer, you could simply choose an air space if it has no insulation. If is does have insulation, select a layer of insulation that approximates the framing and insulation R-Value.
In the Building Tree, select the Assembly to edit it, then go to the Layers tab and make the necessary changes so only one layer in the list shows up as having framing.
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