Unable to convert surfaces into breps

@Robin1 wrote:

I'm doing the tutorials at thinkparametric.com, and I'm having a problem with part 6 of the Waffle Structure tutorial.

In it, you have a bunch of surfaces that you convert to breps, using a script. This is the script.

When trying to execute the script the first time, I get the following error:

Message: unable to convert [, ] into Brep geometry Traceback: line 553, in coercebrep, "C:\Users\Robin\AppData\Roaming\McNeel\Rhinoceros\5.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript\utility.py" line 16, in , "C:\Users\Robin\AppData\Roaming\McNeel\Rhinoceros\5.0\scripts\waffle_script.py" line 995, in IntersectBreps, "C:\Users\Robin\AppData\Roaming\McNeel\Rhinoceros\5.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript\surface.py"

I've removed all non-surface objects from the layers; when I select the objects in the layers, there are only surfaces. What is going wrong?

Here is the model and this is the grasshopper definition.

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