Dynamo Tower > Conceptual Mass > Project not working properly

Unable to create floors, walls, or roof on this conceptual mass which was made with Dynamo in Conceptual Mass Family. Am I missing something?
The below error shows up

“Mass contains only mesh geometry, which can’t be used to compute Mass Floors, volume, or surface area”

Tower_New.dyn (88.8 KB)

As the error states, you need a solid, a closed 3d.