Why isn't my server to client remove event working in game?

I have two scripts; a server script, that is inside the dialog:

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RE = Instance.new("RemoteEvent")
RE.Name = "RE"
RE.Parent = ReplicatedStorage
local screen = game.ServerStorage.ScreenGui
screen.Parent = ReplicatedStorage

script.Parent.DialogChoiceSelected:connect(function(pl ,dc)
    if dc == script.Parent.OpenShop then
        RE:FireClient(pl)
    end
end)

and a local script that is inside starterplayerscripts:

local Players = game:GetService("Players")
local player = Players.LocalPlayer
local playerGui = player:WaitForChild("PlayerGui")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RE = ReplicatedStorage:WaitForChild("RE")
local gui = ReplicatedStorage:WaitForChild("ScreenGui")

RE.OnClientEvent:connect(function(player)
    local sgui= gui:Clone()
    sgui.Parent = playerGui
end)

they're supposed to open a gui if a dialog is chosen and it works when testing in studio, but not ingame. why is that?