KINGFIST - VOLUME 2 QUEST BUGGED

[FabiusPA]

Hi.. this is the screen msg when i try to buy the Paper of 10 soulstone price "Hongmoon Secret Tecnique" for unlock the last step of the quest, after complete all passages.. red and blue tablets, fan, and talk whit NPC at the Mushin's tower, he say me to buy this item but nothing happen.. thes is the screen (naturally ive all skill points) :

EDIT: FOUND SOLUTION, just was necessary for unlock the last step of the secret tecnique, click U, skill, and read the monsters name to hit with that skill, a lot of people have found problem at this point, anyway meybe this post can help someone.
 

http://oi68.tinypic.com/spks9i.jpg