Zindex not working? I need help now! I'm trying to change the zindex of the frame and textlabel.

local playergui = game.Players.LocalPlayer
local frameA = game:GetService("ReplicatedFirst").LocalScript.LoadingScreen.Frame
local frameb = playergui.MenuGui.TextButton
local framec = frameA.TextLabel

frameA.ZIndex = 1
frameb.ZIndex = 2
framec.ZIndex = 2

I'm trying to change the zindex but it's not working, can anyone help me? It's important. `