`DecalMode' could not be found

Hello I downloaded the following package which is the FPS kit:

http://forum.unity3d.com/threads/52651-CoD-Modern-Warfare-style-gun-script

but unfortunately while other had luck running it I haven't been able to. because after importing it even to a clean project I receive the following error: Assets/Standard Assets/Decal System/Decal.cs(72,16): error CS0246: The type or namespace name `DecalMode' could not be found. Are you missing a using directive or an assembly reference?

I know this question perhaps was asked before but the thread was closed without technically being solved. I wonder if anyone found an actual solution to this