How Should I Set my Components to Create an aggregation in Grasshopper?

Hi everyone,
I want to create an aggregation along a loft, using components. I have assigned one component as a group of geometries, and I then set all four components as one whole geometry. However, I keep having an expression error. I don’t know how to fix it. Is the way I set my components at the beginning (on the left bottom) the reason to that error? And how should I fix them? (42.7 KB) exercis3.3dm (3.0 MB)

It look like you’re using the less-than-or-equal sign, . It may help if you type it as two characters, like so <=

Unfortunately, I have tried that and it didn’t work. Grasshopper reads them as the same operators.

your group is outputting a surface.
You then fed the surface into a points component resulting in nulls and the red point component.
This means the data from D is null which gives you an error.

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