I want to set the material parameter in the topography but it seems it did not work is it possible
thnx Edwin
Material parameter’s storage type is not a string - it is expecting a Material element. You can use Material.ByName node like so and it will work:
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Thank you very much.
No problem 
it doesn’t easily seem logical because in Revit you can copy/paste or type the same string for Material Parameter and it will work. I think that functionality is very useful but it also makes it easier for confusion when using Dynamo or working with the API