Thank you Nazca Design developers for making this fantastic tool available!
@Babar, I experienced this same problem. What you are missing is the BBcells() function call using the parenthesis. The following syntax is correct as of version 0.6.1:
import nazca as nd
import nazca.demofab as df
nd.export_gds(df.BBcells(), filename=’BB-list.gds’)
