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src/app/pages/chat/messages/messages.module.ts

@@ -12,6 +12,7 @@ import { BtnModalDismissPage } from 'src/app/shared/btn-modal-dismiss/btn-modal-
 import { FontAwesomeModule } from '@fortawesome/angular-fontawesome';
 import { MatMenuModule } from '@angular/material/menu';
 import { LettersAvatarModule } from "ngx-letters-avatar";
+import { PdfViewerModule } from 'ng2-pdf-viewer';
 
 @NgModule({
   imports: [
@@ -21,7 +22,8 @@ import { LettersAvatarModule } from "ngx-letters-avatar";
     FontAwesomeModule,
     MessagesPageRoutingModule,
     MatMenuModule,
-    LettersAvatarModule
+    LettersAvatarModule,
+    PdfViewerModule
   ],
   declarations: [MessagesPage]
 })