Subsurface is invalid because trimming U and V domains are singular

I am trying to divide a sample surface with graph mappers, and it somehow works, the grid shifts following the mapper’s curves, but still shows an error that says both U and V domains are singular. Can anyone help?

panelsUV.gh (65.3 KB)

Thank you! One follow-up - how do you make grasshoper show factor and bounding box values?

Plugin.

Persistent Data Editor | Food4Rhino

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