22:57:32 Questie: [Migration] Migrating Questie for v6.0.0
22:57:32 Questie: [Migration] Migrated Questie to v6.0.0 and removed 0 party entries from the Journey
22:57:32 Questie: [ERROR] 설치중에 에러 발생! Interface\AddOns\Questie\Localization\l10n.lua:37: attempt to index field 'itemData' (a nil value)

Hey thanks for this report. We already shipped v6.4.1 which should be available soon on CurseForge and so on. You can already grab it off our Discord or here