Ionic slides are not working properly in side navigation menu

tried with update slide but pagination bullets not accurate and slideTo also not working:
please find below code

pagination bullets are not showing activeness correctly when we use pager property to slides. and slideTo not working
menuOpened() {
this.switcher.slideTo(1,200); //this line not working and not showing index 1 slide and pagination bullets are also not shoowing activeness correctly

<ion-menu [content]=“content” (ionOpen)=“menuOpened()”>

<ion-slides #switcher pager (ionSlideDidChange)="slideChanged()"  pager="true">