help me with look system/age system

[FinalX]

hello,
i got a problem with a script of mine and i don't know what i did wrong.

the function. must not show the pokemon age if not filled.
and go on to next rule
i know the problem is in look.lua cript only i dont know what i did wrong.
error i got:

[04/12/2012 14:27:25] [Error - CreatureScript Interface] 
[04/12/2012 14:27:25] data/creaturescripts/scripts/look.lua:onLook
[04/12/2012 14:27:25] Description: 
[04/12/2012 14:27:25] (luaGetItemAttribute) Item not found

[04/12/2012 14:27:25] [Error - CreatureScript Interface] 
[04/12/2012 14:27:25] data/creaturescripts/scripts/look.lua:onLook
[04/12/2012 14:27:25] Description: 
[04/12/2012 14:27:25] data/lib/011-string.lua:16: bad argument #1 to 'find' (string expected, got nil)
[04/12/2012 14:27:25] stack traceback:
[04/12/2012 14:27:25] 	[C]: in function 'find'
[04/12/2012 14:27:25] 	data/lib/011-string.lua:16: in function '(for generator)'
[04/12/2012 14:27:25] 	data/lib/011-string.lua:16: in function 'explode'
[04/12/2012 14:27:25] 	data/lib/age system.lua:2: in function 'getPokemonYears'
[04/12/2012 14:27:25] 	data/lib/age system.lua:38: in function 'getPokemonAge'
[04/12/2012 14:27:25] 	data/creaturescripts/scripts/look.lua:32: in function <data/creaturescripts/scripts/look.lua:1>

lines i wrote:
look.lua

		 if getItemAttribute(pokeball, "pokeballinfo") then
str = str.."\nIt's "..getPokemonAge(thing.uid).." old."
end

problem directions
011-string.lua rule 16

string.explode = function (str, sep, limit)
	if(type(sep) ~= 'string' or isInArray({tostring(str):len(), sep:len()}, 0)) then
		return {}
	end

	local i, pos, tmp, t = 0, 1, "", {}
	for s, e in function() return string.find(str, sep, pos) end do
		tmp = str:sub(pos, s - 1):trim()
		table.insert(t, tmp)
		pos = e + 1

		i = i + 1
		if(limit ~= nil and i == limit) then
			break
		end
	end

	tmp = str:sub(pos):trim()
	table.insert(t, tmp)
	return t
end

age system: rule 2

function getPokemonYears(pokeball)
local data = string.explode(getItemAttribute(pokeball, "pokeballinfo"), "/")
-- data[1] = dia, data[2] = mes, data[3] = ano
local yearnow = math.floor(tonumber(os.date("%Y")))
local monthnow = math.floor(tonumber(os.date("%m")))
local daynow = math.floor(tonumber(os.date("%d")))
local ano = math.floor(tonumber(data[3]))
local mes = math.floor(tonumber(data[2]))
local dia = math.floor(tonumber(data[1]))
local years = 0
if yearnow == ano then years = monthnow-mes end
if yearnow > ano then years = (12-mes) + monthnow end
return years
end

agesystem.lua rule 38

function getPokemonAge(pokeball)
return ""..getPokemonYears(pokeball).." year, "..getPokemonMonths(pokeball).." months"
end

- - - Updated - - -

bump