Workspace is not a valid member of Players?

checkPoints = game.Workspace:WaitForChild("Checkpoints")
local timer = false
game:WaitForChild("Players")

script.Parent.Touched:Connect(function(hit)
	if timer == false then
		timer = true
		if (hit.Parent:FindFirstChild("Humanoid")) then
			local Player = game.Players[hit.Parent.Name]
			if (Player.leaderstats.Lives.Value > 0) then
				Player.leaderstats.Lives.Value = Player.leaderstats.Lives.Value - 1
			end
			if (Player.leaderstats.Lives.Value <= 0) then
				Player.leaderstats.Lives.Value = 3
				Player.leaderstats.World.Value = 1
				Player.leaderstats.Stage.Value = 1
				Player:LoadCharacter()
			else
				local pSpawn = checkPoints:WaitForChild(tostring(Player.leaderstats.World.Value)):WaitForChild(tostring(Player.leaderstats.Stage.Value)) -- Respawns player
		  		hit.Parent.HumanoidRootPart.CFrame = pSpawn.CFrame
			end
		end
		wait(0.5)
		timer = false
	end
end)

This is my code. I even added a "game:WaitForChild("Players")" at the beginning but that didn't work. Also I should mention i'm new to Lua

I'm assuming you're using a part and the child of the part is the script. The reason why the error says 'Workspace is not a valid member of Players' is because It goes usually game.Players.LocalPlayer. If you want to get the player, here's how you do it:

script.Parent.Touched:Connect(function(hit)
	if game.Players:GetPlayerFromCharacter(hit.Parent) then
		--Paste your code here
	end
end)

Use the Players:GetPlayerFromCharacter() function if you want to see if what the part touched is a player.