Namespace error, compiling script and non coder-

I was trying to backup and make new script to get this camrea from clipping,,so easy right ..then I get this: Assets/Sample Assets/Cameras/Scripts/ProtectCameraFromWallClip.cs(5,14): error CS0101: The namespace `global::' already contains a definition for `ProtectCameraFromWallClip' < anyone know whats causing it...im a NON coder atm so I could really use some guidance