Problem with NPC script.

[Nothxbye]

Today i made script for spell learn and im not so good with "table" configurations so i wanna ask if someone who knows his stuff to check srcipt because i have some errors. Also will be awesome if someone check the whole script because i think its not written as it should be i mean "locals" ect.

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)
local talkState = {}
local talkUser = NPCHANDLER_CONVBEHAVIOR == CONVERSATION_DEFAULT and 0 or cid
local spells = {}
local t = {}
function onCreatureAppear(cid)                  npcHandler:onCreatureAppear(cid)                        end
function onCreatureDisappear(cid)               npcHandler:onCreatureDisappear(cid)                     end
function onCreatureSay(cid, type, msg)  npcHandler:onCreatureSay(cid, type, msg)        end
function onThink()                                              npcHandler:onThink()    end
 
function creatureSayCallback (cid, type, msg)
  if(npcHandler.focus ~= cid) then
     return 0
  end

local spells = {
["find person"] = {price = 80},
["light healing"] = {price = 170}
}

     for i, v in pairs(spells) do
          if (string.find(msg, i)) then
          local t = spells[i]
            npcHandler:say("Do you want to buy the spell "..i.." for "..t.price.." gold?", cid)
            talkState[talkUser] = 1
	  elseif (msgcontains(msg, "yes")) and (talkState[talkUser] == 1) then
	       if (getPlayerLearnedInstantSpell(cid,i) ~= TRUE) then
		   if (doPlayerRemoveMoney(cid,t.price) == TRUE) then
		       npcHandler:say("Here you are "..i.." "..t.price..". Look in your spellbook for the pronunciation of this spell.",cid)
		       doSendMagicEffect(getCreaturePosition(cid),12)
		       --playerLearnInstantSpell(cid,i)
		   else
		       npcHandler:say("You need more money.",cid)
                       talkState[talkUser] = 0
		   end
	       else
		       npcHandler:say("You already know how to cast this spell.",cid)
                       talkState[talkUser] = 0
	       end
         end
     end
     return 1
end

npcHandler:setCallback(CALLBACK_GREET, greetCallback)
npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)
npcHandler:addModule(FocusModule:new())

[31/03/2012  19:48:18] Lua Script Error: [Npc interface] 
[31/03/2012  19:48:18] data/npc/scripts/abran.lua:onCreatureSay

[31/03/2012  19:48:18] data/npc/scripts/abran.lua:31: attempt to concatenate field 'price' (a nil value)
[31/03/2012  19:48:18] stack traceback:
[31/03/2012  19:48:18] 	data/npc/scripts/abran.lua:31: in function 'callback'
[31/03/2012  19:48:18] 	./data/npc/lib/npcsystem/npchandler.lua:337: in function 'onCreatureSay'
[31/03/2012  19:48:18] 	data/npc/scripts/abran.lua:10: in function <data/npc/scripts/abran.lua:10>

 

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