How to extrude an open curve along curve without bending

Does anyone know how to extrude this curve along the curve without changing the shape?
I tried sweep as well but it said unable to order shape on rail

Hi Kago - please post a file with the curves.

-Pascal

OffsetSRF ?

Probably because your profile is not one single curve, but a series of segments (maybe grouped)? That’s typically when you get that message. In any case sweep is what you want, not extrude.