Tell Target with Buttons

I am currently having a problem adding the Tell Target action to a button.

The following is the hierarchy of my timeline:

-Root
—Movie Clip (Instance Name=“FadeIn”)
------Button (Instance Name=“Button”)
----------Movie Clip (Instance Name=“About”)

The Movie Clip i’m trying to control is “About”. This MC is also placed within the ‘Over’ state of “Button”

I keep receiving the Target Not Found error in Base="_level0.FadeIn"

Any advice or Syntaxes would be greatly appreciated. Please let me know if you need anymore required information.

Thanx in advance.

Aidan