PVP Arena = Bug

[f@bio]

-- Hello friends, i have a script of PVP-ARENA, and when a player death on arena, this is teleported to outside of arena, and a message apear with winner or looser, but this work fine on a TFS 8.4x and now i have TFS 8.5 and when i use this apear a error on console:

Lua Script Error: [CreatureScript Interface]
data/creaturescripts/scripts/Pvp_Arena.lua:onPrepareDeath

luaDoPlayerSendTextMessage(). Player not found

Lua Script Error: [CreatureScript Interface]
data/creaturescripts/scripts/Pvp_Arena.lua:onPrepareDeath

luaGetCreatureName(). Creature not found

Lua Script Error: [CreatureScript Interface]
data/creaturescripts/scripts/Pvp_Arena.lua:onPrepareDeath

data/creaturescripts/scripts/Pvp_Arena.lua:14: attempt to concatenate a boolean
value
stack traceback:
        data/creaturescripts/scripts/Pvp_Arena.lua:14: in function <data/creatur
escripts/scripts/Pvp_Arena.lua:7>

-- This is my script of arena: Remember this is donwloaded on a foru, but i dont remember the name of owner... credits is totality of owner post...

local arena = {
  frompos = {x=499, y=489, z=9},
  topos = {x=515, y=498, z=9},
  exit = {x=517, y=493, z=8} 
}

function onPrepareDeath(cid, lastHitKiller, mostDamageKiller)
  if isPlayer(cid) == TRUE then
    if isInArea(getPlayerPosition(cid), arena.frompos, arena.topos) then
      if doCreatureAddHealth(cid, getCreatureMaxHealth(cid) - getCreatureHealth(cid), TRUE) == TRUE then
        if doTeleportThing(cid, arena.exit) == TRUE then
          doSendMagicEffect(arena.exit, 10)
          doPlayerSendTextMessage(mostDamageKiller,MESSAGE_STATUS_CONSOLE_BLUE,'[ARENA] Você matou '..getPlayerName(cid)..'!')
          doPlayerSendTextMessage(cid,MESSAGE_STATUS_CONSOLE_BLUE,'[ARENA] Você foi morto por '..getPlayerName(mostDamageKiller)..'!')
          return FALSE
        end
      end
    end
  end
  return TRUE
end

-- Plx help me to solve this problem... i need this... Many thx for all to help me...