WebChromeClient: can't find Taboola native SDK. have you registered the webview?

Hi there,
I via Taboola native to fetch content then I encounter a problem that fellowing below:
I try to upgrade sdk to the latest version but the problem not solve.
=================== Full log =======================================
2019-10-24 10:28:11.476 27777-27777/? D/TaboolaWidget: updateMaxGPUSize :: called
2019-10-24 10:28:11.476 27777-27777/? D/TaboolaWidget: mScreenMaxHeight 1794
2019-10-24 10:28:11.476 27777-27777/? D/TaboolaWidget: setDefValues :: initialize fields with default values
2019-10-24 10:28:11.478 27777-27777/? D/TaboolaWidget: getWebViewClient :: initialized
2019-10-24 10:28:11.478 27777-27777/? D/TaboolaWidget: initWebView :: initialized WebView
2019-10-24 10:28:11.479 27777-27777/? D/TaboolaWidget: updateScrollBehaviour :: scroll enabled false
2019-10-24 10:28:11.480 27777-27777/? D/TaboolaWidget: updateScrollBehaviour :: scroll enabled true
2019-10-24 10:28:11.480 27777-27777/? D/TaboolaJs: setOnClickListener 
2019-10-24 10:28:11.480 27777-27777/? D/TaboolaWidget: publisher[sdk-tester] mode[alternating-widget-without-video-1-on-1] placement[Mid Article] pageType[article] pageUrl[https://blog.taboola.com] viewID[1571884091480]
2019-10-24 10:28:11.492 27777-27777/? D/OptionalPageCommands:  commandToLocalString   {isUsedInTaboolaWidget:'true'}
2019-10-24 10:28:11.492 27777-27777/? D/OptionalPageCommands: getCommandsString  _taboola.push({isUsedInTaboolaWidget:'true'});
2019-10-24 10:28:11.492 27777-27777/? D/TaboolaWidget: loadWebView html:
    <html>
    
    <head>
        <meta name='viewport' content='width=device-width, user-scalable=no'/>
        <script type="text/javascript">
            !function (e, f, u, i) {
                if (!document.getElementById(i)) {
                    e.async = 1;
                    e.src = u;
                    e.id = i;
                    f.parentNode.insertBefore(e, f);
                }
            }(document.createElement('script'),
                document.getElementsByTagName('script')[0],
                'https://cdn.taboola.com/libtrc/sdk-tester/mobile-loader.js',
                'tb-mobile-loader-script');
        </script>
        <link rel="shortcut icon" href="#"/>
    </head>
    
    <body style='margin:0;padding:2px;border:0px blue solid;overflow:visible;'>
    
    <div id='taboola1'>
    </div>
    
    <script type='text/javascript'>
        window._taboola = window._taboola || [];
            _taboola.push({isUsedInTaboolaWidget:'true'}); <!--commandsString-->
    
        _taboola.push({
            article: 'auto', <!--mPageType, mPageId-->
            url: 'https://blog.taboola.com' <!--mPageUrl-->
        });
    
        _taboola.push({
            mode: 'alternating-widget-without-video-1-on-1',
            container: 'taboola1',
            placement: 'Mid Article',
            framework: 'mobile-sdk',
            target_type: 'mix'
        });
    
        _taboola["mobile"] = [];
        _taboola["mobile"].push({
            publisher:"sdk-tester",
            // set view id in order to prevent duplicated between different placements (optional)
            taboola_view_id:1571884091480
        });
    
        _taboola.push({
            flush: true
        });
    
    </script>
    
    </body>
    </html>
2019-10-24 10:28:11.704 27777-27777/? D/WebChromeClient: can't find Taboola native SDK. have you registered the webview?, source: https://cdn.taboola.com/libtrc/sdk-tester/mobile-loader.js From line 1
2019-10-24 10:28:11.910 27777-27777/? D/WebChromeClient: can't find Taboola native SDK. have you registered the webview?, source: https://cdn.taboola.com/libtrc/sdk-tester/mobile-loader.js From line 1