[HELP] !buyaddon script.

[Toitsss]

Hello, trying to improve my server with a !buyaddon command, but apparently it does not work.
buyaddon.lua

-- Buy Addon command by GLupEK -- 
function onSay(cid, words, param)

local nazwy = {{'citizen'}, {'hunter'}, {'mage'}, {'noblewoman', 'nobleman'}, {'summoner'}, {'warrior'}, {'barbarian'}, {'knight'}, {'assassin'}, {'wizard'}, {'oriental'}, {'pirate'}, {'beggar'}, {'norseman'}, {'warmaster'}, {'demonhunter'}, {yalaharian}}
local outfit = {{136, 128}, {137, 129}, {138, 130}, {140, 132}, {141, 133}, {142, 134}, {143, 147}, {139, 131}, {156, 152}, {149, 145}, {150, 146}, {155, 151}, {153, 157}, {252, 251}, {336, 335}, {229, 228}, {325, 324}}
local availability = {{1,2}, {1,2}, {1,2}, {1,2}, {1,2}, {1,2}, {1,2}, {1,2}, {1,2}, {1,2}, {1,2}, {1,2}}
local cost = {{5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}, {5000, 5000}} -- ceny addonow({addon_1, addon_2})
 if param ~= "!buyaddon" then
  local param_info = string.find(param,",")
  local addon_name = string.sub(param,1,param_info-1)
  local addon_number = string.sub(param,param_info+1,string.len(param))
  for i=1, #nazwy do
   for xd=1, 2 do
    if(addon_name~=nazwy[i][xd])then
    doPlayerSendCancel(cid,'This Addon does not exist.')
    else
    if(addon_number==availability[i][xd])then
     if(doPlayerRemoveMoney(cid, cost[i][addon_number]))then
      for add = 1, 2 do
      doPlayerAddAddon(cid, outfit[i][add], addon_number)
      doPlayerSendCancel(cid,'You\'re successfuly bought addon.')
      end
     else
     doPlayerSendCancel(cid, 'You don\'t have enough money for this addon.')
    end
    else
    doPlayerSendCancel(cid, 'This Addon does not exist.')
   end
  end
 end
end
end
end

buyaddon.xml

	<talkaction words="!buyaddon" script="buyaddon.lua" />

and the error it gives

[08/03/2010 17:53:46] [Error - TalkAction Interface] 
[08/03/2010 17:53:46] data/talkactions/scripts/buyaddon.lua:onSay
[08/03/2010 17:53:46] Description: 
[08/03/2010 17:53:46] data/talkactions/scripts/buyaddon.lua:10: attempt to perform arithmetic on local 'param_info' (a nil value)
[08/03/2010 17:53:46] stack traceback:
[08/03/2010 17:53:46] 	data/talkactions/scripts/buyaddon.lua:10: in function <data/talkactions/scripts/buyaddon.lua:2>

[08/03/2010 17:53:47] [Error - TalkAction Interface] 
[08/03/2010 17:53:47] data/talkactions/scripts/buyaddon.lua:onSay
[08/03/2010 17:53:47] Description: 
[08/03/2010 17:53:47] data/talkactions/scripts/buyaddon.lua:10: attempt to perform arithmetic on local 'param_info' (a nil value)
[08/03/2010 17:53:47] stack traceback:
[08/03/2010 17:53:47] 	data/talkactions/scripts/buyaddon.lua:10: in function <data/talkactions/scripts/buyaddon.lua:2>

 

[soul4soul]

im sure this wont make it work but u forgot ' ' around yalarian