Like this?
To function properly, the guide curves must intersect the sections
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I don't understand anymore ...
It looks very similar to this tutorial, doesn't it?
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Deselect the two curves
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yes but I don't make the same dimensions and the same shape
I strongly advise you to do like the tutorial in the 1st place, and then make your project, either from 0 or by modifying the dimensions. (but more perilous)
First of all, you haven't made an inclined plane for the back of the hull (the painting), that's why your sketches don't cross each other.
I have the impression that skipping steps and inevitably, it doesn't work.
practice with Sbadenis' tutorial if you haven't already.
If the occasion I will try to do it too. 
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Same thing, do the tutorial identically in a 1st step. Then modify it in a 2nd step. (I'd rather modify than redo for my part.
The advantage if you modify piece by piece you will know as you go along where it gets stuck and then you correct as you go.
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First of all, the triangle at the front should not be at the end of the bow, but a notch behind, unless it was part of your modifications.
From my point of view this method seems correct as long as the torques are trapezoid and not domed, but I could be wrong.
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Just naval modeling, very long. 
Hello Lenny,
One thing to make sure of is the stability of the sketches. When I look at the function tree, all the sketches are under constraint. (cf: the (-) in front of the sketches). Reprint your sketches and constrain them entirely, either by dimensions or by constraints. (blue sketch==> not good; black sketch==> ok). When you commit a fully constrained sketch, the (-) disappears.
Have a nice day
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Thank you all, I'm only answering now because I had just registered and there was a limited number of messages for the first use for 24 hours, I solved my problem 
It would be nice to explain how, wouldn't it? Then to close the subject.
Thank you
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I redid everything completely with different ribs and I added a plane which makes 8 planes to do the smoothing and which allows to have a structured shape
I have one last question, I realized that the height of my boat does not fall right (on a round number) how to do it?
As your boat is a set of stacked dimensions, you just need to increase a dimension on one of the parts.
This all depends on the round number on the 1/10th, or on the mm, or on the meter in this case, a modification of the keel can be a solution because it does not modify the upper profiles.
Cdlt
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What do you mean by the keel?
In many wooden or plastic boats (without a keel like sailboats) there is a piece of wood that goes from the back to the front and is called a " keel "
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