Help with applying voronoi to subd model

Hi. I have been trying to apply voronoi to my subd structure. ı gives error " boolean instersection is empty. Could you help me understand what is the problem and how can ı fix it.
subdvoronoi.gh (1.3 MB)


ı have been trying to reached this look on my own geometry.

subdvoronoi-1-1.gh (1.2 MB)
hello test it.

it is working now! Thank you so much for your help.

Hi! Sorry to bother you again. As ı progress, another error happening. This time with multipipe. the program says " Solution exception:Object reference not set to an instance of an object". I belive all the curves are closed. What might be the problem you think? Could you looked at it if you are available.
subdvoronoi-1-1 (1).gh (1.2 MB)

subdvoronoi-1-2.gh (1.2 MB)
Hello now test it.