Stirrup with dynamo

Revit
1

I tried to place the stirrups of different spacings with dynamo, I copied the knots but I do not know where the error is.

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2

Is it a 3d view? To make it easier to help, you should show the complete graph and include the error messages. (hoover the yellow bubbles)

3

Los errores son

1: Warning: Null value cannot be cast to Double
2. Warning: Vector.ByTwoPoints operation failed.

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8

I really do not understand much, what I did was copy the knots of a tutorial, but I get that error. The value of the code block

9

Then you should double check that you have connected the wires correctly.

10

Thanks I’ll try