Offset curve error

There is an error coming up while creating the curve offsets. It displays ‘curve offset failed’.
I checked the curves. They have mixed typology of curves which ranges from elliptical curves to arc like and Planar curves.
How do I solve this? (6.6 KB) (10.4 KB)

And if possible, can you please explain why did that error occur?

Thank you

One more question, when I am trying to loft the geometry, the result is an error.
As far as I checked, there is an error of list order. How to math the list of first curves to the second ones?
Thank You

Check this as well. (12.8 KB)

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Thank you