GUI Tweening, I need help?

Script:

--Variables
local Player = game.Players.LocalPlayer
Menu = Player.PlayerGui.Menu
ZC = Player.PlayerGui.ZanpakutoCustomizer

Menu.ZanpakutoCustomizerButton.MouseButton1Down:connect(function()
    --Page1Tweening
    Menu.ZanpakutoCustomizerButton:TweenPosition(UDim2.new(1, 0, 0, 0), "In", "Quad", 2, false)
    Menu.GameNameLabel:TweenPosition(UDim2.new(1, 0, 0, 0), "In", "Quad", 2, false)
    Menu.GameVersionLabel:TweenPosition(UDim2.new(0.25, 0, 1, 0), "Out", "Quad", 2, false)
    Menu.WelcomeToLabel:TweenPosition(UDim2.new(0.25, 0, 1, 0), "Out", "Quad", 2, false)

    --Page2Tweening
    ZC.ZCBackground:TweenPosition(UDim2.new(1, 0, 1, 0), "In", "Quad", 2, false)

end)

Output:

zars15's CFrame loaded 00:33:53.444 - ZanpakutoCustomizer is not a valid member of PlayerGui 00:33:53.445 - Script 'Players.Player1.PlayerGui.Menu.ZanpakutoCustomizerButton.Pa', Line 4 00:33:53.446 - Stack End 00:34:56.270 - Auto-Saving...

I've been trying to find out the problem for hours...