FireClient: player argument must be a Player object?

I'm trying to fire from server to client. The part I have in the workspace:

Workspace
	Part
		Script
		TextButton

And in the StarterGui:

StarterGui
	ScreenGui
		Frame
		LocalScript

The Script:

local button = script.Parent.TextButton
local remEvent = game:GetService("ReplicatedStorage").RemoteEvent

button.MouseButton1Click:Connect(function(player)
	remEvent:FireClient(player)
end)

The LocalScript:

local remEvent = game:GetService("ReplicatedStorage").RemoteEvent

remEvent.OnClientEvent:Connect(function(player)
	script.Parent.Frame.Visible = true
end)

So when a player clicks the text button I wan't the Frame to become visible for the player. The server script doesn't seem to understand what the player is, though I have to put the player there or I get an error "Argument 1 missing or nil". I have thought that I could maybe define the player with a "PlayerAdded" function, but I'm not sure if I want to use it there even if it works.

I think I solved it... kind of. My script worked with a Click Detector, but not with the text buttons, but I don't know why it is like that :/