无法读取Admob原生广告中的属性错误

Question

我正在尝试在我的应用中实施原生广告。我已经完成了所有步骤。我添加了ad_app_install.xml，ad_content.xml的布局。这是我申请原生广告的代码：

AdLoader.Builder builder = new AdLoader.Builder(this, "ca-app-pub-3940256099942544/2247696110");
        AdLoader adLoader = builder.forAppInstallAd(new NativeAppInstallAd.OnAppInstallAdLoadedListener() {
            @Override
            public void onAppInstallAdLoaded(NativeAppInstallAd ad) {
                // An app install ad loaded successfully, call this method again to
                // load the next ad.
                mNativeAds.add(ad);
                loadNativeAd(adLoadCount + 1);

            }
        }).forContentAd(new NativeContentAd.OnContentAdLoadedListener() {
            @Override
            public void onContentAdLoaded(NativeContentAd ad) {
                // A content ad loaded successfully, call this method again to
                // load the next ad.
                mNativeAds.add(ad);
                loadNativeAd(adLoadCount + 1);
            }
        }).withAdListener(new AdListener() {
            @Override
            public void onAdFailedToLoad(int errorCode) {
                // A native ad failed to load. Call this method again to load
                // the next ad in the items list.
                Log.e("MainActivity", "The previous native ad failed to load. Attempting to"
                        + " load another.");
                loadNativeAd(adLoadCount + 1);
            }
        }).build();

我正在使用Admob的虚拟ID。但每次我运行我的应用程序，我收到错误I/Ads: Received log message: <Google:html> Cannot read property 'tracking_urls_and_actions' of undefined我已搜索此错误，我找不到解决方案。