Why isn't my Gui button working?

The button should be removed when it's clicked, and sets the player's walkspeed to 16.. At the moment it does nothing :/

Button = script.Parent -- close button
Button2 = script.Parent.Parent.Parent -- removes the gui

function onClick()
    script.Parent.Parent.Parent.Parent.Parent.Character.Humanoid.Walkspeed = 16 -- sets player's walkspeed to 16
    Button2:Destroy() 


end 

Button.MouseButton1Click:connect(onClick) 

The script is inside an image button, inside a frame, inside a Gui which is inside StarterGui