Why doesn't the gui change colors ? And bug out ?

I made a script that onClick player clicks the gui, then the gui should change colors but when i checked it has 5100,5100,5100 black color heres the script: It just doesn't change to the wanted colors i chosen it changes to gray

function onClick()
	wait(.1)
	script.Parent.Parent.ImageColor3 = Color3.new(122, 36, 38)
	wait(.2)
	script.Parent.Parent.ImageColor3 = Color3.new(200, 59, 63)
end

script.Parent.MouseButton1Click:connect(onClick)

what is wrong ???

i tried with localscript and script, both didn't work and happened the same...