diff --git a/packages/client/src/account.ts b/packages/client/src/account.ts
index 88fc8387d..e39540e47 100644
--- a/packages/client/src/account.ts
+++ b/packages/client/src/account.ts
@@ -78,7 +78,7 @@ function fetchAccount(token: string): Promise<Account> {
 		api('i', {}, token)
 		.then(res => {
 			if (res.error) {
-				if (res.error.id === 'a8c724b3-6e9c-4b46-b1a8-bc3ed6258370') {
+				if (res.error.code === 'SUSPENDED') {
 					showSuspendedDialog().then(() => {
 						signout();
 					});
diff --git a/packages/client/src/components/drive.folder.vue b/packages/client/src/components/drive.folder.vue
index c613571f5..bfc3ffaf6 100644
--- a/packages/client/src/components/drive.folder.vue
+++ b/packages/client/src/components/drive.folder.vue
@@ -207,8 +207,8 @@ function deleteFolder() {
 			defaultStore.set('uploadFolder', null);
 		}
 	}).catch(err => {
-		switch (err.id) {
-			case 'b0fc8a17-963c-405d-bfbc-859a487295e1':
+		switch (err.code) {
+			case 'HAS_CHILD_FILES_OR_FOLDERS':
 				os.alert({
 					type: 'error',
 					title: i18n.ts.unableToDelete,
diff --git a/packages/client/src/components/drive.vue b/packages/client/src/components/drive.vue
index d39e256f8..a3b67a5b2 100644
--- a/packages/client/src/components/drive.vue
+++ b/packages/client/src/components/drive.vue
@@ -258,8 +258,8 @@ function onDrop(ev: DragEvent): any {
 			folderId: droppedFolder.id,
 			parentId: folder?.id ?? null,
 		}).catch(err => {
-			switch (err) {
-				case 'detected-circular-definition':
+			switch (err.code) {
+				case 'RECURSIVE_FOLDER':
 					os.alert({
 						title: i18n.ts.unableToProcess,
 						text: i18n.ts.circularReferenceFolder,
@@ -335,8 +335,8 @@ function deleteFolder(folderToDelete: foundkey.entities.DriveFolder) {
 		// 削除時に親フォルダに移動
 		move(folderToDelete.parentId);
 	}).catch(err => {
-		switch (err.id) {
-			case 'b0fc8a17-963c-405d-bfbc-859a487295e1':
+		switch (err.code) {
+			case 'HAS_CHILD_FILES_OR_FOLDERS':
 				os.alert({
 					type: 'error',
 					title: i18n.ts.unableToDelete,
diff --git a/packages/client/src/components/signin.vue b/packages/client/src/components/signin.vue
index 42f5bf8f0..8f0c5fe17 100644
--- a/packages/client/src/components/signin.vue
+++ b/packages/client/src/components/signin.vue
@@ -185,8 +185,8 @@ function onSubmit() {
 }
 
 function loginFailed(err) {
-	switch (err.id) {
-		case '6cc579cc-885d-43d8-95c2-b8c7fc963280': {
+	switch (err.code) {
+		case 'NO_SUCH_USER': {
 			os.alert({
 				type: 'error',
 				title: i18n.ts.loginFailed,
@@ -194,7 +194,7 @@ function loginFailed(err) {
 			});
 			break;
 		}
-		case '932c904e-9460-45b7-9ce6-7ed33be7eb2c': {
+		case 'ACCESS_DENIED': {
 			os.alert({
 				type: 'error',
 				title: i18n.ts.loginFailed,
@@ -202,11 +202,11 @@ function loginFailed(err) {
 			});
 			break;
 		}
-		case 'e03a5f46-d309-4865-9b69-56282d94e1eb': {
+		case 'SUSPENDED': {
 			showSuspendedDialog();
 			break;
 		}
-		case '22d05606-fbcf-421a-a2db-b32610dcfd1b': {
+		case 'RATE_LIMIT_EXCEEDED': {
 			os.alert({
 				type: 'error',
 				title: i18n.ts.loginFailed,
diff --git a/packages/client/src/pages/page-editor.vue b/packages/client/src/pages/page-editor.vue
index 6f0af17ee..9763e6466 100644
--- a/packages/client/src/pages/page-editor.vue
+++ b/packages/client/src/pages/page-editor.vue
@@ -115,7 +115,7 @@ function save() {
 	const options = getSaveOptions();
 
 	const onError = err => {
-		if (err.id === '3d81ceae-475f-4600-b2a8-2bc116157532') {
+		if (err.code === 'INVALID_PARAM') {
 			if (err.info.param === 'name') {
 				os.alert({
 					type: 'error',
diff --git a/packages/client/src/scripts/get-note-menu.ts b/packages/client/src/scripts/get-note-menu.ts
index 1afab0071..73b960cae 100644
--- a/packages/client/src/scripts/get-note-menu.ts
+++ b/packages/client/src/scripts/get-note-menu.ts
@@ -104,7 +104,7 @@ export function getNoteMenu(props: {
 		os.apiWithDialog(pin ? 'i/pin' : 'i/unpin', {
 			noteId: appearNote.id,
 		}, undefined, null, res => {
-			if (res.id === '72dab508-c64d-498f-8740-a8eec1ba385a') {
+			if (res.code === 'PIN_LIMIT_EXCEEDED') {
 				os.alert({
 					type: 'error',
 					text: i18n.ts.pinLimitExceeded,
@@ -149,7 +149,7 @@ export function getNoteMenu(props: {
 					os.api('clips/add-note', { clipId: clip.id, noteId: appearNote.id }),
 					null,
 					async (err) => {
-						if (err.id === '734806c4-542c-463a-9311-15c512803965') {
+						if (err.id === 'ALREADY_CLIPPED') {
 							const confirm = await os.confirm({
 								type: 'warning',
 								text: i18n.t('confirmToUnclipAlreadyClippedNote', { name: clip.name }),