3D FlipBook - loading percentage is not showing

$("#container").flipBook({
            pdfUrl:url2,
            textLayer: true,
            btnSearch: {
                enabled: true,
                title: "Search",
                icon: "fas fa-search"
            },
            tableOfContent:JSON.parse(chapter_ar),
            btnZoomIn: {
                vAlign: 'top',
                hAlign: 'right'
            },
            btnZoomOut: {
                vAlign: 'top',
                hAlign: 'right'
            },
            // btnToc : {vAlign:'top', hAlign:'right'},
            btnShare: {
                enabled: false
            },
            // btnShare :{vAlign:'top', hAlign:'right',display:'none'},
            btnDownloadPages: {
                vAlign: 'top',
                hAlign: 'right',
                enabled: false
            },
            btnDownloadPdf: {
                vAlign: 'top',
                hAlign: 'right',
                enabled: false
            },
            btnSound: {
                vAlign: 'top',
                hAlign: 'right'
            },
            btnToc: {
                vAlign: 'top',
                hAlign: 'left'
            },
            btnThumbs: {
                vAlign: 'top',
                hAlign: 'left'
            },
            btnBookmark: {
                vAlign: 'top',
                hAlign: 'left'
            },
            btnExpand: {
                vAlign: 'top',
                hAlign: 'right'
            },
            btnPrint: {
                vAlign: 'top',
                hAlign: 'right',
                enabled: false
            },
            currentPage: {
                hAlign: 'center'
            },
            viewMode: '3d',
            skin: 'dark',
            menuMargin: 10,
            menuTransparent: true,
            menuOverBook: true,
            menu2Margin: 10,
            menu2Transparent: true,
            menu2OverBook: true,
            btnBackground: "rgba(0,0,0,.3)",
            btnColor: 'rgb(255,120,60)',
            layout: 4,
            singlePageModeIfMobile: true,
        });

hi, it seems like you use another plugin.