Visibility error on Military Tools

[GabiDorobantu]

Hello! I tried this example https://www.esri.com/arcgis-blog/products/arcgis-pro/national-government/conduct-clearing-operations... and I received an error. First I had the same problem with the Liniar Line of Sight, but I activated the Spatial Analyst extension and fixed it. Now, trying Radial Line of Sight  I have this error. I have followed the steps from the example and nothing. 

I use ArcGIS Pro 2.7.1

Need your help! 

Thank you!