TypeError: 'NurbsCurve' object is not iterable in python in grasshopper

hello, in a python in grasshopper, I’ve got in entry a list of curves, and when i want to loop on this list it return TypeError: ‘NurbsCurve’ object is not iterable
how does it works? I don’t understand what it wait for?

thanks for your help

Right-click on ‘X’ input and set ‘List Access’.

3. Attach minimal versions of all the relevant files

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