The surface does not work along one curve?

the surface does not work along one curve?

I connected it in one line but for some reason it doesn’t create a surface.

пишет “No edges created. The curve should be flat and closed.”

but this flat and closed :frowning:

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The green scale handle indicates that the selected curve isn’t planar. You can try clicking the green square and then scale it by factor ‘0’

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