Pagination not work on ion-slides (Ionic 4)

Ionic Framework
1

Hi,

I’m using Ionic 4 and I try to show ion-slides with his pagination, but it doesn’t work.

My html code is:

<ion-slides (ionSlideDidChange)="sendImageToLedwall()"
                        pager="true"
                        [options]="{pagination: { el: '.swiper-pagination', type: 'bullets', clickable: true}, initialSlide: 0, centeredSlides: true}"
                        #imagesSlider>
                <ion-slide (click)="zoomImage(image)"
                           *ngFor="let image of images[activeColor.code]">
                    <app-image [image]="image"
                               sizeClass="big"></app-image>
                </ion-slide>
</ion-slides>

“Swiperjs” is the library that Ionic use for slider and I check its demo sorce code (https://swiperjs.com/demos/) with pagination.

image
image1920×1004 112 KB

But in my rendering html, I have:
image

Any idea?

Thank you