diff --git a/app/src/main/java/com/wafflestudio/snutt2/lib/network/ApiOnError.kt b/app/src/main/java/com/wafflestudio/snutt2/lib/network/ApiOnError.kt
index 82a259a93..b011c3402 100644
--- a/app/src/main/java/com/wafflestudio/snutt2/lib/network/ApiOnError.kt
+++ b/app/src/main/java/com/wafflestudio/snutt2/lib/network/ApiOnError.kt
@@ -342,7 +342,6 @@ object ErrorCode {
     const val INVALID_EMAIL = 0x300F
     const val VACANCY_PREV_SEMESTER = 0x9C45
     const val VACANCY_DUPLICATE = 0x9FC4
-    const val EMAIL_ALREADY_USING = 0x9FC5
     const val INVALID_NICKNAME = 0x9C48
 
     /* 401 - Request was invalid */
@@ -398,25 +397,10 @@ object ErrorCode {
     const val EMAIL_NOT_FOUND = 0x4006
 }
 
-private fun detailToString(detail: String?): String {
-    return when (detail) {
-        "LOCAL" -> "로컬"
-        "FACEBOOK" -> "페이스북"
-        "GOOGLE" -> "구글"
-        "KAKAO" -> "카카오"
-        else -> ""
-    }
-}
-
 @JsonClass(generateAdapter = true)
 data class ErrorDTO(
     @Json(name = "errcode") val code: Int? = null,
     @Json(name = "message") val message: String? = null,
     @Json(name = "displayMessage") val displayMessage: String? = null,
     @Json(name = "ext") val ext: Map<String, String>? = null,
-    @Json(name = "detail") val detail: ErrorDetail? = null,
-) {
-    data class ErrorDetail(
-        @Json(name = "socialProvider") val socialProvider: String? = null,
-    )
-}
+)