3D basemap solution: Error when running "Add elevation surface to the ground" using the sample data

[Anonymous User]

New to working with LiDAR data;

I am trying to run the 3D basemap solution using the sample data and am getting an error when running the "Add elevation surface to the ground" task tool. It says to choose the "Ground Under Elevation Surfaces" raster but there are three of them as an output for the past task tool. Which one? Or all? I did both and still get the error on the attached pic. 

Yes, I have all the outputs for tasks in the project GDB so I am not sure why the script isn't working.

Thanks!

@Gert_van_Maren 

[Gertvan_Maren1]

Hi Christy,

You need to scroll down in the table of contents and rightclick on the 'Ground'. Then add the elevation source. Or go to add data and Add elevation source.

Let me know if that works for you.

Gert