Why am I getting this error while using TweenPosition?

Error: Error in script: unexpected symbol near '?'

Code:

open.MouseButton1Down:connect(function()
Main.Visible = true
     Main:TweenPosition(UDim2.new(0,60,0,168), 'Out', 'Bounce', 1, true)
    open.Visible = false
    close.Visible = true
end)


close.MouseButton1Down:connect(function()
Main.Visible = false
     Main:TweenPosition(UDim2.new(0,-500,0,168), 'In', 'Linear', 1, true)
    open.Visible = true
    close.Visible = false
end)