repeater ID How it work?

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,
3

Ok but

 $w("#repeater1").onItemReady(($item, itemData, index) => {
        $item("#btnAdd").onClick((event) => {
            console.log('clicked');
            boxId = index;
    });
            
            
            daRimuovere.push(boxId);
            console.log(daRimuovere);
            enableButton()
            
             $w("#repeater1").forItems(daRimuovere, ($item, itemData, index) => {
        $item('#btnAdd').enable;
    });

It return this yellow error:

Wix code SDK Warning: The data that was passed to forItems contained non existing item with the ID: 0 .
Then clicking on other elements always brings me the id of the first one I clicked