TweenSize not working at all in script since ROBLOX Update?

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function onTouch(hit)

    if hit.Parent:FindFirstChild("Humanoid") ~= nil then

        if game.Players:FindFirstChild(hit.Parent.Name) ~= nil then
        local player = game.Players:FindFirstChild(hit.Parent.Name)

            if player:FindFirstChild("PlayerGui"):FindFirstChild("ScreenGui") == nil then
            sg = Instance.new("ScreenGui")
            sg.Parent = player:FindFirstChild("PlayerGui")
            end

        if player.PlayerGui.ScreenGui:FindFirstChild("MessageBox") == nil then

        local f = Instance.new("ImageLabel") --does not appear anymore in online play...
        f.Name = "MessageBox"
        f.Position = UDim2.new(0.15, 0, 0.65, 0)
        f.Size = UDim2.new(0,0, 0,0)        
        f.Image = "rbxassetid://752446664"                          
        f.Parent = player.PlayerGui:FindFirstChild("ScreenGui")
        f.BackgroundTransparency = 1

        local g = Instance.new("ImageLabel")
        g.Name = "MessageBox"
        g.Position = UDim2.new(0.17, 0, 0.68, 0)
        g.Size = UDim2.new(0.085, 0, 0.17,  0)      
        g.Image = "rbxassetid://629080158"                          
        g.Parent = player.PlayerGui:FindFirstChild("ScreenGui")
        g.BackgroundTransparency = 1

        local d = Instance.new("ImageLabel")
        d.Name = "MessageBox"
        d.Position = UDim2.new(0.17, 0, 0.68, 0)
        d.Size = UDim2.new(0.085, 0, 0.17,  0)      
        d.Image = "rbxassetid://629096041"                          
        d.Parent = player.PlayerGui:FindFirstChild("ScreenGui")
        d.BackgroundTransparency = 1







wait()
f:TweenSize(UDim2.new(0.7,0, 0,170), 'Out' ,'Quad' , 0.5)


while true do
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    wait(0.05)
    d.ImageTransparency=  1
    wait(0.05)
    d.ImageTransparency = 0
    break
end

wait(5)
f:TweenSize(UDim2.new(0, 0,0, 0), 'Out' ,'Quad' , 0.5)

wait(1)
        d:Destroy()
        g:Destroy()
        f:Destroy()

        end
        end
    end
end

script.Parent.Touched:connect(onTouch)