Cutting surface in Catia V5R20

I asked this question at
I could not add the tutorial and part model there.

Please refer to Tutorial 1-B from Page 28.
I am trying to cut a surface from a sweep geometry in a block. I am getting the error
"A skin does not cut across one of the volume: the split cannot be computed"
I have attached the two images. Please advise how I can remove this error. I shall be grateful. Thanks

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