Expected identifier when parsing expression, got ‘)’?

Hello, so I was making a blocker system for my open gui, when someone is sitting in a car and clicks on it, it is supposed to play an error sound. But for some reason it is not working. I get Expected identifier when parsing expression, got ‘)’. But you need a ) for the end for it to work properly??

local remEvent = game.ReplicatedStorage:WaitForChild("OpenGUI")
script.Parent.ClickDetector.MouseClick:Connect(function(player)
    local character = player.Character or player.CharacterAdded:wait()
if character.Humanoid.Sit == false then
        remEvent:FireClient(player)
    else
        script.Parent.ERROR:Play()
end)