diff --git a/projects/ucap-webmessenger-api-message/src/lib/apis/send.ts b/projects/ucap-webmessenger-api-message/src/lib/apis/send.ts
index 39d9559f..0518b8b6 100644
--- a/projects/ucap-webmessenger-api-message/src/lib/apis/send.ts
+++ b/projects/ucap-webmessenger-api-message/src/lib/apis/send.ts
@@ -4,7 +4,8 @@ import {
   APIJsonEncoder,
   APIDecoder,
   APIFormDataEncoder,
-  ParameterUtil
+  ParameterUtil,
+  MessageStatusCode
 } from '@ucap-webmessenger/api';
 import { DeviceType } from '@ucap-webmessenger/core';
 import { MessageType } from '../types/message.type';
@@ -82,7 +83,7 @@ export const encodeSend: APIFormDataEncoder<SendRequest> = (
 
 export const decodeSend: APIDecoder<SendResponse> = (res: any) => {
   return {
-    responseCode: res.responseCode,
+    responseCode: res.responseCode as MessageStatusCode,
     responseMsg: res.responseMsg
   } as SendResponse;
 };
diff --git a/projects/ucap-webmessenger-api-message/src/lib/services/message-api.service.ts b/projects/ucap-webmessenger-api-message/src/lib/services/message-api.service.ts
index 7f0be966..f43d5bc2 100644
--- a/projects/ucap-webmessenger-api-message/src/lib/services/message-api.service.ts
+++ b/projects/ucap-webmessenger-api-message/src/lib/services/message-api.service.ts
@@ -168,7 +168,7 @@ export class MessageApiService {
       'POST',
       this.urls.sendNewMessage,
       encodeSend(req),
-      { reportProgress: true, responseType: 'text' as 'json' }
+      { reportProgress: true }
     );
 
     const progress = req.fileUploadItem.uploadStart();
@@ -196,7 +196,7 @@ export class MessageApiService {
       'POST',
       this.urls.editReservationMessageEx,
       encodeEditReservation(req),
-      { reportProgress: true, responseType: 'text' as 'json' }
+      { reportProgress: true }
     );
 
     const progress = req.fileUploadItem.uploadStart();
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-nav.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-nav.component.ts
index ff44f3f2..25f3c2e8 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-nav.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-nav.component.ts
@@ -1,57 +1,20 @@
-import { UserSelectDialogType } from '../../../types/userselect.dialog.type';
 import {
   Component,
   OnInit,
-  Output,
-  EventEmitter,
-  ViewChildren,
-  QueryList,
-  ElementRef,
   OnDestroy,
-  ViewChild
 } from '@angular/core';
 import { NGXLogger } from 'ngx-logger';
-import { ucapAnimations, DialogService } from '@ucap-webmessenger/ui';
-import {
-  CreateChatDialogComponent,
-  CreateChatDialogData,
-  CreateChatDialogResult
-} from '@app/layouts/messenger/dialogs/chat/create-chat.dialog.component';
-import { Subscription, Observable, merge } from 'rxjs';
+import { ucapAnimations } from '@ucap-webmessenger/ui';
+import { Subscription, Observable, } from 'rxjs';
 import { Store, select } from '@ngrx/store';
 
 import * as AppStore from '@app/store';
-import * as ChatStore from '@app/store/messenger/chat';
 import * as MessageStore from '@app/store/messenger/message';
-import * as SyncStore from '@app/store/messenger/sync';
 import * as SettingsStore from '@app/store/messenger/settings';
-import { UserInfo } from '@ucap-webmessenger/protocol-sync';
-import {
-  UserInfoSS,
-  UserInfoF,
-  UserInfoDN
-} from '@ucap-webmessenger/protocol-query';
 import { MatTabChangeEvent } from '@angular/material';
-import { LoginResponse } from '@ucap-webmessenger/protocol-authentication';
-import { OpenProfileOptions } from '@ucap-webmessenger/protocol-buddy';
-import { SessionStorageService } from '@ucap-webmessenger/web-storage';
-import { VersionInfo2Response } from '@ucap-webmessenger/api-public';
-import { MessageType } from '@ucap-webmessenger/api-message';
-import { tap } from 'rxjs/operators';
 import {
-  MessageWriteDialogComponent,
-  MessageWriteDialogResult,
-  MessageWriteDialogData
-} from '../dialogs/message/message-write.dialog.component';
-import {
-  EnvironmentsInfo,
-  KEY_ENVIRONMENTS_INFO,
-  KEY_VER_INFO,
   MainMenu
 } from '@app/types';
-import { MessageBoxComponent } from './left-sidenav/message.component';
-import { environment } from '../../../../environments/environment';
-import { TranslateService } from '@ngx-translate/core';
 
 @Component({
   selector: 'app-layout-messenger-left-nav',
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.ts
index c388fa50..30642ab0 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/message/message-write.dialog.component.ts
@@ -1,7 +1,13 @@
 import { Component, OnInit, Inject, ViewChild } from '@angular/core';
 import { MatDialogRef, MAT_DIALOG_DATA } from '@angular/material';
 
-import { DialogService, SnackBarService } from '@ucap-webmessenger/ui';
+import {
+  DialogService,
+  SnackBarService,
+  AlertDialogComponent,
+  AlertDialogResult,
+  AlertDialogData
+} from '@ucap-webmessenger/ui';
 
 import {
   DetailResponse,
@@ -32,13 +38,14 @@ import {
   EnvironmentsInfo,
   KEY_VER_INFO
 } from '@app/types';
-import { take } from 'rxjs/operators';
+import { take, tap } from 'rxjs/operators';
 import { UserInfoSS } from '@ucap-webmessenger/protocol-query';
 import { TranslateService } from '@ngx-translate/core';
 import { VersionInfo2Response } from '@ucap-webmessenger/api-public';
 import { SessionStorageService } from '@ucap-webmessenger/web-storage';
 import { environment } from '../../../../../environments/environment';
 import { EmployeeType } from '@ucap-webmessenger/protocol-room';
+import { MessageStatusCode } from '@ucap-webmessenger/api';
 
 export interface MessageWriteDialogData {
   loginRes: LoginResponse;
@@ -155,23 +162,93 @@ export class MessageWriteDialogComponent implements OnInit {
       .pipe(take(1))
       .subscribe(
         res => {
-          let msg = '';
-          if (!!message.reservationTime) {
-            msg = this.translateService.instant(
-              'message.results.successForReservation'
-            );
+          if (!!res && res.responseCode === MessageStatusCode.Success) {
+            let msg = '';
+            if (!!message.reservationTime) {
+              msg = this.translateService.instant(
+                'message.results.successForReservation'
+              );
+            } else {
+              msg = this.translateService.instant(
+                'message.results.successForSending'
+              );
+            }
+
+            this.snackBarService.open(msg, '', {
+              duration: 3000,
+              verticalPosition: 'bottom'
+            });
+
+            this.dialogRef.close({ sendFlag: true, sendType: message.type });
           } else {
-            msg = this.translateService.instant(
-              'message.results.successForSending'
-            );
+            let alertType = 'S';
+            let errorMsg =
+              this.translateService.instant('message.errors.failToSending') +
+              `(${res.responseCode})`;
+            switch (res.responseCode) {
+              case MessageStatusCode.Fail_Msg_Reservation_Time_Null:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToReservationTimeEmpty'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_Msg_Title_length:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToTitleLength'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_Msg_Reservation_Time_Less:
+              case MessageStatusCode.Fail_Msg_Edit_Reservation_Time_Less:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToReservationTimeLess'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_Msg_Edit_Cancel_Reservation_Sended:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToReservationSended'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_File_Size:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToFileSize'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_File_Ext:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToFileExt'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_Cancelled_Msg:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToCancelled'
+                );
+                alertType = 'A';
+                break;
+            }
+
+            if (alertType === 'S') {
+              this.snackBarService.open(errorMsg, '', {
+                duration: 3000,
+                verticalPosition: 'bottom'
+              });
+            } else {
+              this.dialogService.open<
+                AlertDialogComponent,
+                AlertDialogData,
+                AlertDialogResult
+              >(AlertDialogComponent, {
+                data: {
+                  title: this.translateService.instant('message.errors.label'),
+                  message: errorMsg
+                }
+              });
+            }
           }
-
-          this.snackBarService.open(msg, '', {
-            duration: 3000,
-            verticalPosition: 'bottom'
-          });
-
-          this.dialogRef.close({ sendFlag: true, sendType: message.type });
         },
         error => {
           this.snackBarService.open(
@@ -199,18 +276,88 @@ export class MessageWriteDialogComponent implements OnInit {
       .pipe(take(1))
       .subscribe(
         res => {
-          this.snackBarService.open(
-            this.translateService.instant(
-              'message.results.successForModifying'
-            ),
-            '',
-            {
-              duration: 3000,
-              verticalPosition: 'bottom'
-            }
-          );
+          if (!!res && res.responseCode === MessageStatusCode.Success) {
+            this.snackBarService.open(
+              this.translateService.instant(
+                'message.results.successForModifying'
+              ),
+              '',
+              {
+                duration: 3000,
+                verticalPosition: 'bottom'
+              }
+            );
 
-          this.dialogRef.close({ sendFlag: true, sendType: message.type });
+            this.dialogRef.close({ sendFlag: true, sendType: message.type });
+          } else {
+            let alertType = 'S';
+            let errorMsg =
+              this.translateService.instant('message.errors.failToSending') +
+              `(${res.responseCode})`;
+            switch (res.responseCode) {
+              case MessageStatusCode.Fail_Msg_Reservation_Time_Null:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToReservationTimeEmpty'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_Msg_Title_length:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToTitleLength'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_Msg_Reservation_Time_Less:
+              case MessageStatusCode.Fail_Msg_Edit_Reservation_Time_Less:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToReservationTimeLess'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_Msg_Edit_Cancel_Reservation_Sended:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToReservationSended'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_File_Size:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToFileSize'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_File_Ext:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToFileExt'
+                );
+                alertType = 'A';
+                break;
+              case MessageStatusCode.Fail_Cancelled_Msg:
+                errorMsg = this.translateService.instant(
+                  'message.errors.failToCancelled'
+                );
+                alertType = 'A';
+                break;
+            }
+
+            if (alertType === 'S') {
+              this.snackBarService.open(errorMsg, '', {
+                duration: 3000,
+                verticalPosition: 'bottom'
+              });
+            } else {
+              this.dialogService.open<
+                AlertDialogComponent,
+                AlertDialogData,
+                AlertDialogResult
+              >(AlertDialogComponent, {
+                data: {
+                  title: this.translateService.instant('message.errors.label'),
+                  message: errorMsg
+                }
+              });
+            }
+          }
         },
         error => {
           this.snackBarService.open(
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/native/components/top-bar.component.html b/projects/ucap-webmessenger-app/src/app/layouts/native/components/top-bar.component.html
index 59d313b6..5f5e39a0 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/native/components/top-bar.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/native/components/top-bar.component.html
@@ -4,7 +4,11 @@
   </div>
   <div class="app-layout-native-title-bar-title">DS Talk</div>
   <div class="btn-area">
-    <ucap-integrated-search-form (search)="onIntegratedSearch($event)" class="input-lineless integrated-search">
+    <ucap-integrated-search-form
+      *ngIf="!!loginRes"
+      (search)="onIntegratedSearch($event)"
+      class="input-lineless integrated-search"
+    >
     </ucap-integrated-search-form>
     <div
       *ngIf="!!loginRes && !!weblink"
@@ -147,7 +151,10 @@
         </svg>
       </button>
     </div>
-    <span *ngIf="(!!weblink && weblink.length > 0) || (updateInfo$ | async)" class="stroke-bar"></span>
+    <span
+      *ngIf="(!!weblink && weblink.length > 0) || (updateInfo$ | async)"
+      class="stroke-bar"
+    ></span>
     <ucap-profile-my-profile-widget
       [profileImageRoot]="sessionVerinfo.profileRoot"
       [profileImageFile]="getMyProfileImageWidget()"
diff --git a/projects/ucap-webmessenger-app/src/assets/i18n/en.json b/projects/ucap-webmessenger-app/src/assets/i18n/en.json
index cd41ab2a..6ea63256 100644
--- a/projects/ucap-webmessenger-app/src/assets/i18n/en.json
+++ b/projects/ucap-webmessenger-app/src/assets/i18n/en.json
@@ -327,6 +327,13 @@
       "label": "Message error",
       "failToSending": "The message failed to send.",
       "failToModify": "The message failed to modify.",
+      "failToReservationTimeEmpty": "No reservation time is specified.",
+      "failToTitleLength": "Title is too long",
+      "failToReservationTimeLess": "Reservation time can not be sent within 10 minutes.",
+      "failToReservationSended": "You can't edit a message that has already been sent.",
+      "failToFileSize": "The file you are uploading is larger than the limit.",
+      "failToFileExt": "The file you uploaded contains restricted files.",
+      "failToCancelled": "This message has been canceled.",
       "minTimeReservation": "It can be set only 30 minutes after the current time.",
       "cancelledError": "The message failed to cancel.",
       "cancelledMessage": "This message has been cancelled."
diff --git a/projects/ucap-webmessenger-app/src/assets/i18n/ko.json b/projects/ucap-webmessenger-app/src/assets/i18n/ko.json
index f7cd0a56..ef00f144 100644
--- a/projects/ucap-webmessenger-app/src/assets/i18n/ko.json
+++ b/projects/ucap-webmessenger-app/src/assets/i18n/ko.json
@@ -327,6 +327,13 @@
       "label": "쪽지 에러",
       "failToSending": "쪽지를 전송에 실패 하였습니다.",
       "failToModify": "쪽지 수정에 실패 하였습니다.",
+      "failToReservationTimeEmpty": "예약시간이 지정되어 있지 않습니다.",
+      "failToTitleLength": "제목이 너무 길게 입력되었습니다.",
+      "failToReservationTimeLess": "예약시간이 현재시간 기준 10분 이내에는 보낼수 없습니다.",
+      "failToReservationSended": "이미 발송된 메시지는 수정할 수 없습니다.",
+      "failToFileSize": "업로드 하는 파일의 용량이 제한크기보다 큽니다.",
+      "failToFileExt": "업로드 하는 파일에 제한된 파일이 포함되었습니다.",
+      "failToCancelled": "발송 취소된 메시지 입니다.",
       "minTimeReservation": "현재 시각으로부터 30분 이후로만 설정 가능합니다.",
       "cancelledError": "발송 취소에 실패 하였습니다.",
       "cancelledMessage": "발송 취소된 쪽지 입니다."
diff --git a/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.html b/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.html
index 61082e77..611dc245 100644
--- a/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.html
+++ b/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.html
@@ -58,9 +58,12 @@
       <mat-form-field class="message-title">
         <input
           matInput
+          #inputTitle
           formControlName="title"
           placeholder="{{ 'message.fieldTitle' | translate }}"
+          maxlength="100"
         />
+        <mat-hint align="end">{{ inputTitle.value?.length || 0 }}/100</mat-hint>
       </mat-form-field>
 
       <div class="message-content">