TypeError: c.uploadFiles is not a function

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$w . onReady ( function () {
$w ( “#repeater1” ). onItemReady (( $item , itemData , index ) => {

    $item ( "#button2" ). enable (); 

    $item ( "#button2" ). onClick ( **async**  ( event ) => { 
        console . log ( 'In Save' )

await $item ( ‘#dataset10’ ). save ();
session . setItem ( ‘Errormessage’ , “Data Saved” );
wixWindow . openLightbox ( “Error” )
});
});
})