Is TweenPosition broke or something? My script will not working for some reason.

My TweenPosition script is not working and I have no idea why.

function hide(name)
	name:TweenPosition(UDim2.new(0, 0, 1, -50), 'Out', 'Bounce', 1)
end


script.Parent.Parent.Players.PlayerAdded:connect(function(player)
	local SMGuiC = script.Parent.Parent.ServerStorage:WaitForChild("SMGui"):Clone()
	local smtext = SMGuiC:WaitForChild("SM").SMText
	smtext.Text = "You joined the server with Rank "..player:GetRankInGroup(3583996)
	SMGuiC.Parent = script.Parent.Parent.StarterGui
	SMGuiC.SM.Visible = true
	wait(3)
	print("you got mail")
	hide(SMGuiC.SM)
	wait(1)
end)

The server doesn't have access to the PlayerGui if FE is on. Do this on the client.

LocalScript in theSMText component of the gui. Place the gui in StarterGui.

local player = game.Players.LocalPlayer
local smtext - script.Parent

function hide(name)
    name:TweenPosition(UDim2.new(0, 0, 1, -50), 'Out', 'Bounce', 1)
end

smtext.Text = "You joined the server with Rank "..player:GetRankInGroup(3583996)
wait(3)
print("you got mail")
hide(smtext.Parent)