Check On : C:\L2JServer\gameserver\data\jscript\custom\NPCBuffer
and open the file : __init__
if i Understand you have L2j Pack!
maybe the buffer is for L2jOneo(e.g)
from net.sf.l2j.gameserver.model.actor.instance import L2PcInstance
from java.util import Iterator
from net.sf.l2joneo.gameserver.datatables import SkillTable
from net.sf.l2joneo import L2DatabaseFactory
from net.sf.l2oneoj.gameserver.model.quest import State
from net.sf.l2joneo.gameserver.model.quest import QuestState
from net.sf.l2joneo.gameserver.model.quest.jython import QuestJython as JQuest
may may change it to :
from net.sf.l2j.gameserver.model.actor.instance import L2PcInstance
from java.util import Iterator
from net.sf.l2j.gameserver.datatables import SkillTable
from net.sf.l2j import L2DatabaseFactory
from net.sf.l2j.gameserver.model.quest import State
from net.sf.l2j.gameserver.model.quest import QuestState
from net.sf.l2j.gameserver.model.quest.jython import QuestJython as JQuest