I dont get it too bc for some reason its the same error i tried to make a text pop up from the bottom of the screen but the tween doesnt work, why?

heres my code:

game.Players.PlayerAdded:Connect(function(plr)

local PopUpTweenInfo = TweenInfo.new(2, Enum.EasingStyle.Back)
local PopUpTweenGoal = {
    Position = 0.196,0,0.136,0
}
local PopUpTween = TS:Create(PopUpFrame, PopUpTweenInfo, PopUpTweenGoal)
task.wait(8)
PopUpTween:Play()

end)