Problem with Override SetCutBackgroundPattern

I Can not get this python script to work
i can set the cutbackgroundpatterncolor but i can not set the pattern
i tried severel things in this python script
What is wrong?Element.OverrideCutFillColorInView.dyf (10.9 KB)

i used the node from @john_pierson package

i use revit 2019 and dynamo
and i want to change the background pattern

Forgot UnwrapElement

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