Lua NPC buy with bp

[plakyra]

Hello.
I have The Forgotten Server v0.2.7 (Mystic Spirit)
and i cant use options "buy with backpack"
All items are bought normal...

Script of one npc:

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)
local talkState = {}

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

local shopModule = ShopModule:new()
npcHandler:addModule(shopModule)

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shopModule:addBuyableItem({'instense healing'}, 2265, 95, 1, 'intense healing rune')
shopModule:addBuyableItem({'ultimate healing'}, 2273, 175, 1, 'ultimate healing rune')
shopModule:addBuyableItem({'magic wall'}, 2293, 350, 3, 'magic wall rune')
shopModule:addBuyableItem({'destroy field'}, 2261, 45, 3, 'destroy field rune')
shopModule:addBuyableItem({'light magic missile'}, 2287, 40, 10, 'light magic missile rune')
shopModule:addBuyableItem({'heavy magic missile'}, 2311, 120, 10, 'heavy magic missile rune')
shopModule:addBuyableItem({'great fireball'}, 2304, 180, 4, 'great fireball rune')
shopModule:addBuyableItem({'explosion'}, 2313, 250, 6, 'explosion rune')
shopModule:addBuyableItem({'sudden death'}, 2268, 350, 3, 'sudden death rune')
shopModule:addBuyableItem({'death arrow'}, 2263, 300, 3, 'death arrow rune')
shopModule:addBuyableItem({'paralyze'}, 2278, 700, 1, 'paralyze rune')
shopModule:addBuyableItem({'animate dead'}, 2316, 375, 1, 'animate dead rune')
shopModule:addBuyableItem({'convince creature'}, 2290, 80, 1, 'convince creature rune')
shopModule:addBuyableItem({'chameleon'}, 2291, 210, 1, 'chameleon rune')
shopModule:addBuyableItem({'desintegrate'}, 2310, 80,  3, 'desintegreate rune')

shopModule:addBuyableItemContainer({'bp ap'}, 2002, 8378, 2000, 1, 'backpack of antidote potions')
shopModule:addBuyableItemContainer({'bp slhp'}, 2000, 8610, 400, 1, 'backpack of small health potions')
shopModule:addBuyableItemContainer({'bp hp'}, 2000, 7618, 900, 1, 'backpack of health potions')
shopModule:addBuyableItemContainer({'bp mp'}, 2001, 7620, 1000, 1, 'backpack of mana potions')
shopModule:addBuyableItemContainer({'bp shp'}, 2000, 7588, 2000, 1, 'backpack of strong health potions')
shopModule:addBuyableItemContainer({'bp smp'}, 2001, 7589, 1600, 1, 'backpack of strong mana potions')
shopModule:addBuyableItemContainer({'bp ghp'}, 2000, 7591, 3800, 1, 'backpack of great health potions')
shopModule:addBuyableItemContainer({'bp gmp'}, 2001, 7590, 2400, 1, 'backpack of great mana potions')
shopModule:addBuyableItemContainer({'bp gsp'}, 1999, 8376, 3800, 1, 'backpack of great spirit potions')
shopModule:addBuyableItemContainer({'bp uhp'}, 2000, 8377, 6200, 1, 'backpack of ultimate health potions')
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end

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

Can anyone help?