Lofted protrusion without twisting

I'm trying to make a lofted protrusion but I can't manage to prevent it from twisting, the sections used for the lofting are non-periodic curves (3th degree splines). When I tried vertex mapping an error message came up saying "error with aligning the periodic origins". Does anyone know what my mistake is and how I can fix it? thanks in advance

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I think if your profiles all had the same number of vertice it may line up. It looks as if it's giving the appearance of twist due to matching of the profiles. Sometimes one profile can be created in a different direction from another & get weird protrusions.
That's all I've got.

Regards,
Bogeyman

 
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