The fallbackUrl Attribute

Hi,
I'm using this plugin and i'm happy with it.
In order to customize the default image loader, i guess i shoudld use [fallbackUrl]

But i still have the default image.
Can anyone help me out, please?

Here is what i did in my html file 

`<ionic-image-cache [fallbackUrl]="'assets/imgs/holder.jpg'" [src]="getApiUrlDataloc+''+p.eventcom_cover"></ionic-image-cache>`