How Do I Get The Local Player From A Server Script?

So I have had an issue with values not saving to a leaderboard because it was a local script so here I have a server script I made but I get the following error:

Script:3: attempt to index local 'user' (a nil value)

So the problem is, how do I get the player who clicked the text button in a server script?

local function onClicked(player)
	local user = game.Players:GetPlayerFromCharacter(player)
		local stats = user:findFirstChild("leaderstats")
		if stats ~= nil then
			local cash = stats:findFirstChild("Money")
			cash.Value  = cash.Value + 500
	else
		print("Error1")
	end
end

script.Parent.MouseButton1Click:connect(onClicked)

Only client side items can grab localplayer. Use an argument, like ontouched for example. Its arg is the part that touched it. Same applies to click-detectors.

To access the local player from a script, you could use something like this:

local players = game.Players
wait(1)
local camera = workspace.Camera
local player = nil
for i, v in pairs(players:GetPlayers()) do
	if v.Name ~= camera.CameraSubject.Parent.Name then
		player = v
	end
end

This will only work if the camera subject is the character, though.