Compiler Errors PLEASE HELP

Hi, I have downloaded a tutorial on how to create a Space Shooter game and keep getting these compiler errors and was wondering would anyone know how to help me fix them.

Errors:
Assets/Standard Assets/Effects/ImageEffects/Scripts/Antialiasing.cs(20,33): error CS0246: The type or namespace name `PostEffectsBase’ could not be found. Are you missing a using directive or an assembly reference?

Assets/Standard Assets/Effects/ImageEffects/Scripts/BloomAndFlares.cs(35,35): error CS0246: The type or namespace name `PostEffectsBase’ could not be found. Are you missing a using directive or an assembly reference?

Assets/Standard Assets/Effects/ImageEffects/Scripts/BloomOptimized.cs(9,35): error CS0246: The type or namespace name `PostEffectsBase’ could not be found. Are you missing a using directive or an assembly reference?

and many more very similar to this.
Thanks for the help

PostEffectsBase is the base class (the one that is inherited from) for some of the ImageEffects classes I believe. Apparently, it’s missing in your install and I had a similar problem when I downloaded the assets so it must either be in another folder in the standard assets somewhere or just missing altogether. You can solve it the way I did and just delete the scripts that the error refers to if you don’t need them or you can re-import the Standard Assets package and look for the PostEffectsBase script somewhere in there.

That’s not very helpful as its basically saying that magically it will appear. there has to be a file in which it is defined