【Wallacei】Simulation finishes instantly after pressing “Start”

Grasshopper Wallacei
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1

Hi, I’m currently using WallaceiX 2.7 with Rhino 8 and Ladybug Tools 1.9.0.
I rebuilt my Grasshopper definition from scratch, but when I press “Start”, the simulation finishes instantly without running any generations.

Previously, my custom Grasshopper file worked perfectly fine, but suddenly Wallacei stopped running simulations, even though I haven’t changed the environment (only minor edits inside the definition).

I’ve already checked the following points:

  • Solver is enabled

  • Genes are merged into one list (6 parameters)

  • Objectives return numeric values (not null)

  • Phenotype is empty (to keep the simulation light)

  • Reset and Clear Cache are executed before running

Interestingly, the official Wallacei Example File runs normally,
but my own file instantly shows “Simulation Finished”.

Could anyone help me identify what might cause this behavior or how to fix it?

Attachments:

  • Screenshot of Wallacei showing “Simulation Finished”

  • Environment info:

    • Rhino 8.15

    • Wallacei 2.7

    • Ladybug Tools 1.9.0

    • Windows 10 / 11

スクリーンショット 2025-11-12 120331
スクリーンショット 2025-11-12 1203312394×1439 269 KB

2

you should connect your number sliders and/or gene pools (your parameters) directly to Wallacei component and not via an intermediary component like merge!

1 Like
3

Thank you so much for the clarification!
After connecting all sliders/gene pools directly into Wallacei (without using Merge),
the simulation runs correctly now.
Your advice solved the problem — really appreciate it!

1 Like