i can't get the spline wrapper 2 to work with sweep nurbs. i carefully watched the demo video on the website but when I want to apply my sweep nurb to the wrapper2 just a small linear spline appears

when I change the wrapping mode nothing happens. also when i put the spline of the original sweep into the backbone the very short generate spline dissapears.
i recreated the situation in the demo video step by step but i just wont work.
i attached a screenshot of the scene.
i would appreciate some feedback on what i am doing wrong.
thanks a lot!
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