Roblox wont let my script work it only works if i go disable it then enable it ?

ok so I made this admin script, I think the code is perfect

-- made by vocules

Admins = {"Vocules","Player1","Player2"} -- put the admins here

Prefix = "-" -- Change to your prefix  you want
for i,v in pairs (game.Players:GetPlayers()) do
	v.Chatted:connect(function(msg)
		if msg:lower() == Prefix .. "help" then
			print(Admins[math.random(0,3)])
		end
	end)
end

then I ran into some lame problem I try to press play and then i say -help and then it doesnt print it, but if I go to properties when im playing it disabled and then enable the script everytime i say help it works.. but that is just a pain plus there is no properties in the roblox game.

the script is global and in workspace.