(Error Included) Problems selling items to NPC

[Awpolo]

[24/11/2015 14:19:08] [Error - Npc interface]
[24/11/2015 14:19:08] (Unknown script file)
[24/11/2015 14:19:08] Description:
[24/11/2015 14:19:08] data/npc/lib/npcsystem/modules.lua:1229: bad argument #2 to 'error' (number expected, got string)
[24/11/2015 14:19:08] stack traceback:
[24/11/2015 14:19:08] [C]: in function 'error'
[24/11/2015 14:19:08] data/npc/lib/npcsystem/modules.lua:1229: in function 'callbackOnSell'
[24/11/2015 14:19:08] data/npc/lib/npcsystem/npchandler.lua:265: in function 'processModuleCallback'
[24/11/2015 14:19:08] data/npc/lib/npcsystem/npchandler.lua:450: in function 'onSell'
[24/11/2015 14:19:08] data/npc/lib/npcsystem/modules.lua:1296: in function <data/npc/lib/npcsystem/modules.lua:1295>
[24/11/2015 14:28:00] > Broadcasted message: "Full server save within 120 seconds, please mind it may freeze!".

Using TFS 0.3.6 CryingDamson v8.2
Client version 8.60
Bank System is set to false
Any ideas guys?

Was searching earlier and found it may be the items.xml file but im not sure which file i need. Thanks for all the help!

 

[Xagul]

Cannot help you without those scripts... Please post them. May also need the script for the npc you are trying to sell to when the error occurs.