PolyCurve.ByjoinedCurves node issue

Thank you Mellouze!:wink:
Problem solved for the first node.
However, the second node is telling me ā€œWarning:Floor.ByOutlineTypeAndLevel operation failed.
The multiplicities of other interior knots must be at most degree - 2.
Parameter name: knotsā€
I saw this issue several times but I still don’t understand the meaning and what I have to do!
What is the tips to solve that please?
Thank you very much!