(?) LeaveGuiEvent is not a valid member of ReplicatedStorage "ReplicatedStorage"

I get an error LeaveGuiEvent is not a valid member of ReplicatedStorage "ReplicatedStorage" when I run the script. Who can help.

Error:
14:40:45.300 Untitled Game @ 23 ??? 2022 14:40 auto-recovery file was created - Studio 14:40:46.569 LeaveGuiEvent is not a valid member of ReplicatedStorage "ReplicatedStorage" - Server - TouchGateScript:4 14:40:46.569 Stack Begin - Studio 14:40:46.569 Script 'Workspace.2 Player.Gate2.TouchGateScript', Line 4 - Studio - TouchGateScript:4 14:40:46.569 Stack End - Studio 14:41:45.412 Disconnect from ::ffff:127.0.0.1|58000 - Studio

local TS = game:GetService("TeleportService")
local TweenService = game:GetService("TweenService")
local placeId = "9444338921" -- Enter a second Id Place.
local leaveGuiEvent = game.ReplicatedStorage.LeaveGuiEvent
local TransitionEvent = game.ReplicatedStorage.TransitionEvent
local list = {}
local billboard = script.Parent.billboardPart.billboardGui
local timer
local teleporting = false
local spawnTeleport = script.Parent.spawn

local function updateGui()
	billboard.Frame.players.Text = "Players: " ..#list.. "/2" -- Change the number 16 according to the Max Player who want to be teleported.
end

local function removeFromList(character)
	for i=1,#list do
		if list[i] == character.Name then
			table.remove(list,i)
			updateGui()
		end
	end
end

local function teleportPlayers()
	if #list > 0 then
		billboard.Frame.Status.Text = "TELEPORTING"
		billboard.Frame.Status.TextColor3 = Color3.fromRGB(255, 0, 0)
		local playersToTeleport = {}
		local teleportTime = 0
		for i=1,#list do
			if game.Players:findFirstChild(list[i]) then
				table.insert(playersToTeleport,game.Players:findFirstChild(list[i]))
				TransitionEvent:FireClient(game.Players:findFirstChild(list[i]))
			else
				table.remove(list,i)	
			end
		end 
		local code = TS:ReserveServer(placeId)
		teleporting = true
		TS:TeleportToPrivateServer(placeId,code,playersToTeleport)
		repeat wait() until #list <= 0
		billboard.Frame.Status.Text = "READY"
		billboard.Frame.Status.TextColor3 = Color3.fromRGB(255, 0, 0)
		teleporting = false
	end
end

script.Parent.Gate.Touched:Connect(function(hit)
	if hit.Parent:findFirstChild("Humanoid") then
		if teleporting == false then
			local char = hit.Parent
			local player = game.Players:FindFirstChild(char.Name)
			local alreadyExists = false
			
			for i=1,#list do
				if list[i] == char.Name then
					alreadyExists = true
				end
			end
			
			if alreadyExists == false then
				if #list < 2 then -- Many Players have been teleported.
					table.insert(list,char.Name)
					char.PrimaryPart.CFrame = spawnTeleport.CFrame
					updateGui()
					leaveGuiEvent:FireClient(player)
				end
				
				player.CharacterRemoving:connect(function(character)
					removeFromList(character)
				end)
			end
			
		end
	end
end)

leaveGuiEvent.OnServerEvent:Connect(function(player)
	if player.Character then
		player.Character.HumanoidRootPart.Anchored = false
		wait()
		player.Character.Humanoid.Jump = true
		wait()
		player.Character:MoveTo(game.Workspace.leaveRoomPart.Position)
		removeFromList(player.Character)
	end
end)

while wait() do
	timer = 15 -- Wait time before teleport change to whawtever you want it to be
	for i=1,timer do
		timer = timer - 1
		billboard.Frame.time.Text = timer
		wait(1)
	end
	teleportPlayers()
end