What means "Expected <eof>, got 'until'"?

This error shows in this script, what that means and how to fix it?

Player = game.Players.LocalPlayer
Button = script.Parent
Item = game.ReplicatedStorage:FindFirstChild("SnowCannon")
Cost = 110
Cash = game.Players.LocalPlayer.leaderstats:FindFirstChild("Cash")
until

Button.MouseButton1Click:Connect(function(purchase)
    if Cash.Value > (Cost - 1) then 
        Cash.Value = Cash.Value - Cost
        local a = Item:Clone()
        a.Parent = Player.Backpack
        local b = Item:Clone()
        b.Parent = Player.StarterGear
    end
end)