Collection modifed

Revit
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Hi,
I am currently following the course called “Dynamo 2.x Essential Training” on Linkedin learning.
One of the exercises asks you to use the node StructuralFraming.BeamByCurve. I am using the file provided by the instructor, which already has the node, but I keep having the Warning: Collection modified. Does anyone know how to fix that?

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Thanks for your help

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Hi @NicolasZx and welcome here…could you show an image with the whole graph with all nodes expanded ?

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Hi @sovitek , thanks for your welcome. I actually just found the solution. The mode PolyCurve.ByPoints has a “Polycurve” output while the node StructuralFraming.BeamByCurve has a “Curve” input. The warning disappears when I add a node “PolyCurve.Curves” in between.
The instructor doesn’t have this issue in his video. Maybe he is using an older version of Dynamo?

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image1350×561 164 KB

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Thank you, NicholasZx, I was having this exact issue with that tutorial. I appreciate you posting the solution.

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Thank you I was having the exact same issue, this helped me to solve it.

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Thank you for posting this. I was really struggling and I did not get responses in the Revit forum. Glad I found it here. It works!