ClearWithSkybox is not a member of unity.GL

Assets/Standard Assets/Image Effects (Pro Only)/Image Based/Sources/SunShafts.js(152,28): BCE0019: ‘ClearWithSkybox’ is not a member of ‘UnityEngine.GL’.

I get this message everytime I try to play my game. In addition to that I cant drag an drop a scripts on objects. It says you need to fix all compile errors in all scripts first.
Any ideas?

I’m just guessing as to the cause of the problem here, but are you using the Pro version of Unity, or the free version?

Im using the free version 2.6

Download the free version of 3

Using the free version of U3 though won’t help.
The shafts will not work either it will just stop to bring up the compilation error but Pro only stuff will remain pro only stuff (be it sunshafts / render texture in general or the GL class)