I am following the tutorial and everything is working perfectly execpt the Canvas Group is messing with the buttons; making them unclickable and they have no animations. I have just set up the Animator and was about to apply the scripts, the time for the tutorial is aprox 55:00.

I am getting the following error:

MissingMethodException: Cannot find the requested method
UnityEngine.UI.Selectable.OnCanvasGroupChanged () (at C:/buildslave/unity/build/Exensions/guisystem/UI/Core/Selectable.cs:136)