"object reference not set to an instance"

Revit
1

Hello

while trying to write a script to parse some data, i get this warning:
image

could someone help me to what is meant by it? the “elements.getcategory” is from archilab,
also, is there a workflow using OOTB nodes, to get the category of an element?

2

Hi @NERDASORUS ,

Hard to say without knowing what your input is and without knowning what your Revit and Dynamo versions are. By they way “Element.GetCategory” is OOTB, so try that one instead.

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