Tween does not animate the animation?

Hello there So Ive been trying to tween my gui's but this problem keeps on hapening No matter what I do whenever I run the game the tween animation never happens and just skips to the location where I set my tween here is the code I want the tween to run automaticly when a player joins the game so please help me out with this Here is the code

player = game.Players.LocalPlayer gui = player.PlayerGui.ScreenGui.mover

gui:TweenPosition(UDim2.new(0,779,0.379,0),"In","Bounce",1)

I am pretty sure I did everything correctly but I dont know why it is not doing the animation and just skips do the position

lol it works fine i tried it And it works Fine

player = game.Players.LocalPlayer 
gui = player.PlayerGui.ScreenGui.mover
gui:TweenPosition(UDim2.new(0,779,0.379,0),"In","Bounce",1)

Make sure to spell everything Correct and If u keep getting the same error click on it And try to solve it But i tried it and it worked just fine for me