diff --git a/src/main/kotlin/com/wafflestudio/csereal/core/news/api/NewsController.kt b/src/main/kotlin/com/wafflestudio/csereal/core/news/api/NewsController.kt
index 58bbf76b..0f253dc7 100644
--- a/src/main/kotlin/com/wafflestudio/csereal/core/news/api/NewsController.kt
+++ b/src/main/kotlin/com/wafflestudio/csereal/core/news/api/NewsController.kt
@@ -1,6 +1,5 @@
 package com.wafflestudio.csereal.core.news.api
 
-import com.wafflestudio.csereal.common.CserealException
 import com.wafflestudio.csereal.common.aop.AuthenticatedStaff
 import com.wafflestudio.csereal.common.utils.getUsername
 import com.wafflestudio.csereal.core.news.dto.NewsDto
diff --git a/src/main/kotlin/com/wafflestudio/csereal/core/notice/api/NoticeController.kt b/src/main/kotlin/com/wafflestudio/csereal/core/notice/api/NoticeController.kt
index 2b5f37f6..9d5dd471 100644
--- a/src/main/kotlin/com/wafflestudio/csereal/core/notice/api/NoticeController.kt
+++ b/src/main/kotlin/com/wafflestudio/csereal/core/notice/api/NoticeController.kt
@@ -1,6 +1,5 @@
 package com.wafflestudio.csereal.core.notice.api
 
-import com.wafflestudio.csereal.common.CserealException
 import com.wafflestudio.csereal.common.aop.AuthenticatedStaff
 import com.wafflestudio.csereal.common.utils.getUsername
 import com.wafflestudio.csereal.core.notice.dto.*
diff --git a/src/main/kotlin/com/wafflestudio/csereal/core/seminar/api/SeminarController.kt b/src/main/kotlin/com/wafflestudio/csereal/core/seminar/api/SeminarController.kt
index 7449f7b7..fe744ccc 100644
--- a/src/main/kotlin/com/wafflestudio/csereal/core/seminar/api/SeminarController.kt
+++ b/src/main/kotlin/com/wafflestudio/csereal/core/seminar/api/SeminarController.kt
@@ -1,6 +1,5 @@
 package com.wafflestudio.csereal.core.seminar.api
 
-import com.wafflestudio.csereal.common.CserealException
 import com.wafflestudio.csereal.common.aop.AuthenticatedStaff
 import com.wafflestudio.csereal.common.utils.getUsername
 import com.wafflestudio.csereal.core.seminar.dto.SeminarDto