The selected Existing Construction Assembly is a certain type (Wall, Slab, Roof, Door) but you have it selected incorrectly. For instance, you may have selected this assembly in the tree under the Slab On Grade entry, then modified the type in the library to be a raised floor. Click on the Libraries selection at the bottom left, select the assembly in the Assembly Library and change the type by using the green Import button and selecting the correct type.
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