Problem encountered when attempting to ISOTRIM a surface

I’m relatively new here and learning to create complex designs in Grasshopper. Currently, I’m working on a script to “isotrim” a surface into a random pattern. However, when I connect the constructed domain to the isotrim component, nothing happens. Instead, I receive the following error message:

“Subsurface is invalid because the trimming V-domain is singular.”

I hope someone can assist me with this issue. Thank you very much.
10_The Arc.gh (64.3 KB)

missing

10_The Arc Edited v0.gh (88.7 KB)

thank you so much Quan Li, but I am trying to create a random pattern, something like this:

Thanks for trying to help. Yeah, I use telephaty to get more organize scripts, I guess this is the plug in you are missing.

10_The Arc Edited v1.gh (127.1 KB)

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Thank you so much Quan.