NPC Not working!!

[Spoking]

Hello, when i talk to my npcs they talk back, but when i want to sell anything, it gives this error:

[07/07/2008  12:42:00] Lua Script Error: [Npc interface] 
[07/07/2008  12:42:00] data/npc/scripts/loot.lua:onCreatureSay

[07/07/2008  12:42:00] data/npc/lib/npcsystem/modules.lua:39: attempt to call global 'getPlayerName' (a nil value)
[07/07/2008  12:42:00] stack traceback:
[07/07/2008  12:42:00] 	data/npc/lib/npcsystem/modules.lua:39: in function 'callback'
[07/07/2008  12:42:00] 	data/npc/lib/npcsystem/keywordhandler.lua:40: in function 'processMessage'
[07/07/2008  12:42:00] 	data/npc/lib/npcsystem/keywordhandler.lua:168: in function 'processNodeMessage'
[07/07/2008  12:42:00] 	data/npc/lib/npcsystem/keywordhandler.lua:128: in function 'processMessage'
[07/07/2008  12:42:01] 	data/npc/lib/npcsystem/npchandler.lua:265: in function 'onCreatureSay'
[07/07/2008  12:42:01] 	data/npc/scripts/loot.lua:10: in function <data/npc/scripts/loot.lua:10>

Using TFS rev949 (tibia 8.2)
Could someone help me?

 

[zniC]

Seems to me like they don't want to cooperate with the npcsystem xD