NPC error for 8.6

[King Yoshi]

Hello I am having a major issue. My NPC's will not buy loot from players. I went and manually fixed to where they would sell certain item,s but when I fixed the sellables (or i thought i fixed) it was broken still. I get this message every single time someone tries to sell something.

[09/02/2014 18:07:20] [Error - Npc interface]
[09/02/2014 18:07:20] (Unknown script file)
[09/02/2014 18:07:20] Description:
[09/02/2014 18:07:20] data/npc/lib/npcsystem/modules.lua:1229: bad argument #2 to 'error' (number expected, got string)
[09/02/2014 18:07:20] stack traceback:
[09/02/2014 18:07:20] [C]: in function 'error'
[09/02/2014 18:07:20] data/npc/lib/npcsystem/modules.lua:1229: in function 'callbackOnSell'
[09/02/2014 18:07:20] data/npc/lib/npcsystem/npchandler.lua:265: in function 'processModuleCallback'
[09/02/2014 18:07:20] data/npc/lib/npcsystem/npchandler.lua:450: in function 'onSell'
[09/02/2014 18:07:20] data/npc/lib/npcsystem/modules.lua:1296: in function <data/npc/lib/npcsystem/modules.lua:1295>

 

[Limos]

http://otland.net/threads/npcs-broken.209064/#post-2003512