add private atribuite

src/app/services/chat/room.service.ts

@@ -20,7 +20,7 @@ export class RoomService {
   private hasLoadHistory = false
   duration  = ''
   
-  ToastService = ToastsService
+  private ToastService = ToastsService
 
   constructor(
     public WsChatService: WsChatService,

src/app/shared/chat/messages/messages.page.ts

@@ -133,7 +133,7 @@ export class MessagesPage implements OnInit, OnChanges, AfterViewInit, OnDestroy
     ev.target.complete();
   }
 
-  scrollToBottom(): void {
+  scrollToBottom = () => {
     try {
       if(this.scrollingOnce){
         this.myScrollContainer.nativeElement.scrollTop = this.myScrollContainer.nativeElement.scrollHeight;