My custom health bar script isn't working, Why? [solved]

It's supposed to make my custom health bar change the color from red to green, and change the size, but it doesn't do anything, why?

function barFunction(plr) -- supposed to make me custom health bar work
    local gui = plr.PlayerGui:WaitForChild("Health", 99)
    local hbar = gui:WaitForChild("Bar", 99)
    local playerhp = gui:WaitForChild("PlayerHealth", 99)
    local maxhealth = gui:WaitForChild("MaxHealth", 99)
    local percent = playerhp.Value / maxhealth.Value
    playerhp.Changed:connect(function()
        --//color
        local green = percent
        local red = 1 - green
        hbar.BackgroundColor3 = Color3.new(red,green,0)
        --//size
        hbar.Size = UDim2.new(0,percent * x,0,y)
    end)
end


game.Players.PlayerAdded:Connect(function(plr)
    barFunction(plr) -- launches it
end)