What version of Revit are you using? The method was changed in Revit 2017 so the node will probably not work in 2016 or earlier releases.
If that’s the case you can have a look at this post;
What version of Revit are you using? The method was changed in Revit 2017 so the node will probably not work in 2016 or earlier releases.
If that’s the case you can have a look at this post;