Output says "Argument 1 missing or nil" when trying to fire client event?

I'm trying to make a script that will fire the client on a remote event when you click a textbutton of a surfacegui to make a localscript run. When I try to click the texbutton, the only thing the output gives is "Argument 1 missing or nil" and nothing else. I've tried for hours putting things in different locations but nothing has worked. Here is the script:

local ReplicatedStorage = game.ReplicatedStorage
local Button = game.Workspace.GUI.SurfaceGui.SoundID

function clicked(player)
	ReplicatedStorage.ShowGUI:FireClient()
end

Button.MouseButton1Click:Connect(clicked)

Any help is appreciated!

FireClient() needs 1-2 arguments.

First: The player to fire to. In this case, it's "player", on line 1.

Second: Any other arguments you want to send, but argument #2 is not necessary in all cases. In your case, we don't need any other data, so we leave argument #2 empty, because you just need to show a GUI.

The error "Argument #1 missing or nil" means that you haven't supplied any player to fire to.

Try this:

game.Players.PlayerAdded:Connect(function(player)

local ReplicatedStorage = game.ReplicatedStorage
local Button = game.Workspace.GUI.SurfaceGui.SoundID

local function clicked()
	ReplicatedStorage.ShowGUI:FireClient(player)
end

Button.MouseButton1Click:Connect(clicked)
end)

Hope this helped!