Wavy form loft issue

I’m trying to create a wavy form loft. Somewhat like this

However, in the end, I’m getting error during the loft.

wavy form loft attempt.gh (69.0 KB)

Please advise a method to resolve the trouble.

wavy form loft attempt_re.gh (66.2 KB)

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Thank you so much! How did you figure out that all the curves needed to be flipped ? And the specific guide curve to do it?

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Thanks again.

Did a curve analysis and found the curve directions. Now I realize all the curves should be pointing in the left direction using the lowermost horizontal curve as the guide curve as done by you in the solution.

After having probably decades of experience, flipping curve for troubleshooting might have become a second nature in your workflow! :grinning: