Floor Generation from ListsOFLists

Hey Guys- I am trying to capitalize on the power of lists to prevent myself from having 6 copies of a series of nodes.
I have 2 list of lists: one contains curves and the other contains floor types. I want the first floor type to apply to the first list of curves, second floor type to the second list of curves, and so on. However, i get the error as seen in the image. Is it that the floor creation node cannot work that way or it just something stupid i am doing?