Game portal changing script not working? Roblox

So I'm not sure what I'm doing wrong but the following script gives the following error:

local TeleportService = game:GetService("TeleportService") local gameID = (The Game ID)

function onTouched(hit) local player = game.Players:GetPlayerFromCharacter(hit.Parent) if player then TeleportService:Teleport(gameID, player) end end

script.Parent.Touched:connect(onTouched)

Error: 08:31:42.355 - Workspace.Waterfall Level Portal.To Game Script:2: attempt to perform arithmetic (sub) on nil

I'm trying to simply make a portal from one game to another; thanks ahead for your help.