attempt to concatenate a boolean value

[DiZzyMaN]

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[16/06/2013 18:22:11] [Error - CreatureScript Interface] 
[16/06/2013 18:22:11] In a timer event called from: 
[16/06/2013 18:22:11] data/creaturescripts/scripts/updatemh.lua:onLogin
[16/06/2013 18:22:11] Description: 
[16/06/2013 18:22:11] data/creaturescripts/scripts/updatemh.lua:9: attempt to concatenate a boolean value
[16/06/2013 18:22:11] stack traceback:
[16/06/2013 18:22:11] 	data/creaturescripts/scripts/updatemh.lua:9: in function <data/creaturescripts/scripts/updatemh.lua:4>

Script:

local tfs_version = true
local otswe_updatetime = 3 -- Seconds
 
function updateMH(cid) 
    if isPlayer(cid) then
                update = addEvent(updateMH, otswe_updatetime*1000, cid)
    end
    if tfs_version == true then
		doPlayerSendCancel(cid, "Your Currently Health Is: "..getCreatureHealth(cid).."/"..getCreatureMaxHealth(cid).." And Your Currently Mana Is: "..getCreatureMana(cid).."/"..getCreatureMaxMana(cid)..".")
		else
		doPlayerSendCancel(cid, "Your Currently Health Is: "..getPlayerHealth(cid).."/"..getPlayerMaxHealth(cid).." And Your Currently Mana Is: "..getPlayerMana(cid).."/"..getPlayerMaxMana(cid)..".")
		end
	return true
end
 
function onLogin(cid)
	if isPlayer(cid) then
		update = addEvent(updateMH, 1*1, cid)
		return true
	end
end
 
function onLogout(cid)
	if isPlayer(cid) then
		stopEvent(update)
		return true
	end
end