FireServen can only be called from the client, i really dont know what is this how do i fix it? [closed]

when i press a part, the gui changes btw heres the script

local function click(player)
    game.Workspace.Countdown.BrickColor = BrickColor.new("New Yeller")
    player.Character.Head.Anchored = true

    wait(10)

    game.Workspace.Countdown.BrickColor = BrickColor.new("Lime green")
    player.Character.Head.Anchored = false

    local ReplicatedStorage = game:GetService("ReplicatedStorage")

    local remoteEvent = ReplicatedStorage:WaitForChild("RemoteEventGuiColor")

    remoteEvent:FireServer()player.PlayerGui.TasksBar.t2.BackgroundColor3 = Color3.new(0.0980392, 1, 0)
    remoteEvent.OnServerEvent:Connect(player)

    end

workspace.Task1.ClickDetector.mouseClick:connect(click)