Split walls by grids or reference planes

Im trying to make this work - https://dynamonodes.com/2017/10/27/parts-divideparts/
but I keep getting this warning!

Im new at Dynamo so I need some help.
I want a node to do something similar like the one above. I would like one or more walls to be divided by one or more reference planes or grids.

I hope that someone can help me



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