Items in the extra NPC can not be purchased

anyone can help me? I am having a problem .. items in the extra NPC can not be bought. which strangely again all NPC to show what I insert in the NPC. but why can not be bought

[IMG]http://i1321.photobucket.com/albums/...ps9bxojxy8.jpg[/IMG]

[IMG]http://i1321.photobucket.com/albums/...psentvzvri.png[/IMG]

[IMG]http://i1321.photobucket.com/albums/...psimswr0j1.png[/IMG]

Hi there,

pls use search function then you found this thread

regards