I can't apply an Image Effect Script to the main camera?

I can’t apply any of the following Image Effect Scripts to the main camera?

http://unity3d.com/support/documentation/Components/comp-ImageEffects.html

These are the steps I am taking:

  • Load Unity with the default AngryBots project
  • Load the image effect: Assets → Image Effects
  • Select the main camera: Hierarchy → Main Camera
  • Add the effect to the main camera: Component → Image Effects → Blur
  • Enable the effect: Inspector → Blur Effect (Script)

Nothing happens. What have I done wrong?

I got the same problem… well, at least, something similar.

Any Image Effects I add to my Main Camera appears disabled in the Inspector. When I try to turn it On, it stays disabled.

It’s says:
NullReferenceException: Object reference not set to an instance of an object

It would be nice if anybody knew the problem. Thank you!