Kyutee

Hello, I'm currently dealing with a issue regarding one of my 40 arc missions. I have manage to battle all other bosses leading up this mission of "defeat kiemon" Which I have manage to defeat kiemon on 3 different occasions with a team and still it doesn't acknowledge the kill for the mission to be completed. I spoke with the npc in the shack and get a weird msg that tells me to "relog/restart the client, you may need to kill a single mob for the debug to register" Which again I have followed the direction and still the issue remains. I'm trying to resolve this problem so I can enjoy and continue on with my experience on Ninonline. please help :c (I have closed out the game, restarted my pc, and still the issue remains) error bug