Walls curve not extracted in dynamo

DesignScript
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Hello i have walls in revit and i want to place roof on these walls in revit by dynamo , so i think i should extract curve of walls as seen in Question Answers somewhere on this platform . but when i follow the same nodes like select modal elements and element.curve , the list is empty

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Try Element.Location

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still not working

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o you were talking about element.getlocation
it worked actually