Looks like you have a problem related to Items/monster drops...
Your error is... and translates too...
이 몬스터 최대 레벨(150)을 초과하는 아이템이 존재합니다
"The monsters are items that exceed the maximum level of 150 exists"
So some item drops with a level higher than 150 (seems with multiple items)....
Look at...