Missing one file

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Material/Lit/LitUI.cs

             var hdPipeline = RenderPipelineManager.currentPipeline as HDRenderPipeline;
             var diffusionProfileSettings = hdPipeline.diffusionProfileSettings;
 
-            if (diffusionProfileSettings == null)
+            if (hdPipeline.IsInternalDiffusionProfile(diffusionProfileSettings))
-                EditorGUILayout.HelpBox("No Subsurface Scattering Settings have been assigned to the render pipeline asset.", MessageType.Warning);
+                EditorGUILayout.HelpBox("No diffusion profile Settings have been assigned to the render pipeline asset.", MessageType.Warning);
                 return;
             }