Why isnt the text label showing up when the frame fades out?

Im trying to make text to appear after the screen fades out into black but nothing is showing up.

local On = true

function touched(Part)
    if On == true and Part.Parent.Humanoid~=nil then
        On = false 


        local n = Part.Parent.Name

        local a = Instance.new("ScreenGui",game.Players[n].PlayerGui)

        local b = Instance.new("Frame",a)

        a.IgnoreGuiInset = true

        b.BackgroundColor3 = Color3.new(0,0,0)

        b.Size = UDim2.new(1000,1000,1000,1000)

        b.BackgroundTransparency = 1

        repeat 


            b.BackgroundTransparency = b.BackgroundTransparency - 0.05
            wait(0.1)

        until b.BackgroundTransparency <= 0


        wait(1)
        game.StarterGui.ScreenGui.e.TextTransparency = 0

        repeat 

            b.BackgroundTransparency = b.BackgroundTransparency + 0.05
            wait(0.1)

        until b.BackgroundTransparency >= 1

        a:Remove()
        On=false

    end
end