Why isn't the local script activating?

I have a map script that doesn't work with FE(it works without it, though). The server script in SSS fires a remote event, which is supposed activates a local script in StarterPlayerScripts to make a gui.

--firing part of server script
local re = game:GetService("ReplicatedStorage").RemoteEvents.Regen
re:FireAllClients()--it successfully fires

--local script
local rs = game:GetService("ReplicatedStorage")
local re = rs.RemoteEvents.Regen
local player = game.Players.LocalPlayer
re.OnClientEvent:Connect(function()
    local gui = player:WaitForChild("PlayerGui")
    local f = rs.GUI
    local clock = gui:WaitForChild("Timer").TextLabel
    local a = f.Regen:Clone()
    a.Parent = gui
    local b = f.CloseRegen:Clone()
    wait(9.5)
    b.Parent = gui
    wait(.5)
    a:Destroy()
    b:Destroy()
    player.Character:BreakJoints()
    clock.Text = "300"
end)

Keep in mind there are no errors, and everything is valid. I'm going to add security after I get the script to actually work.