Hello,
I don't frequent the Playmaker forums, so please contact me directly in the future using the Support thread in the Unity forums, a PM or via email. Hutong Games does not maintain Grid Framework, let's not waste their time
Anyway, let's first make sure we get the trivial issues sorted out: First of all, the file extension has to be rsp. Unity will hide file extensions in the editor, so navigate to the file and make sure it has no other file extension after it (like smcs.rsp.txt). Second, the file has to be in the "Assets" directory of the project, not the root of the project. The "Assets" directory is what the Unity editor shows in the Project view. Third, you have to run Unity's compiler after writing the file. The easiest way to force the compiler to run again is to create a new C# script, you can then delete it afterwards.
EDIT: OK, I have found to errors. The first one is that Playmaker already defines actions "GetMaterial" and "SetMaterial", those need to be renamed to something like "GetGridMaterial" and "SetGridMaterial" instead. Rename the classes in Assets/Plugins/GridFramework/PlaymakerActions/GetSet/Renderer/GridRenderer.cs
The other issue is that the actions for the sphere renderer are wrong. It's easiest if you just delete the file Assets/Plugins/GridFramework/PlaymakerActions/GetSet/Renderer/Spherical/Sphere.cs
Now it's working on my end. I have been about to publish an update anyway, so I'll include these fixes. Until the update gets approve those two changes should tie you over.