Your Surface component is empty - you need to Internalize it’s data and re-post your GH file.
Here’s a cluster I’ve been using for quite a while that applies a Voronoi to a curved surface. This file might require GH6, or the add-on that has to do with Voxels - I really don’t recall which it is.
The Voxel related parameters are fairly sensitive, so be careful with changing them.
Make Voronoi.gh (164.9 KB)