self interscting splines is not allowed in sketches in revit

[Jamal_fadi]

advise to solve the issue 

[barthbradley]

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@Jamal_fadi wrote:

advise to solve the issue 

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Don't intersect splines.   

https://parametricmonkey.com/2017/01/16/revit-splines/

[alan.johnson7YLND]

When you draw the spline don't try and close it, leave a small gap and close it with a line between the end points of the spline.

[ToanDN]

Maybe post a screenshot of the spline you are sketching instead of the error message because we can read it already from your subject line.