Android 无法在Jetpack Compose中显示Admob原生广告

我正在try 使用XML格式显示AdMob原生广告，并在Jetpack Compose中使用androidViewBinding.广告根本没有显示，但我没有收到任何有用的错误消息.

在onAdFailedToLoad以内，我只得到"内部错误."例外.

对于xml本身，当我验证文件时，我得到"错误:(5，42)cvc-elt.1.a:找不到元素‘com.google.android.gms.ads.nativead.NativeAdView’."的声明.

我在build.gradle文件中启用了viewBinding.已添加所有必要的依赖项.

这是可组合函数:

@Composable
fun NativeAdView(adUnitId: String) {
    Box(modifier = Modifier.defaultMinSize(minHeight = 200.dp)) {
        AndroidViewBinding(
            factory = { inflater, parent, attachToParent ->
                val binding = NativeAdViewBinding.inflate(inflater, parent, attachToParent)
                val adView = binding.root.also { adView ->
                    adView.headlineView = binding.adHeadline
                    adView.iconView = binding.adAppIcon
                }
                try {
                    val adLoader = AdLoader.Builder(
                        adView.context,
                        adUnitId,
                    )
                        .forNativeAd { nativeAd ->
                            nativeAd.icon?.let {
                                binding.adAppIcon.setImageDrawable(it.drawable)
                                binding.adAppIcon.isVisible = true
                            }
                            nativeAd.headline?.let {
                                if (it.isNotBlank()) {
                                    binding.adHeadline.text = it
                                    binding.adHeadline.isVisible = true
                                }
                            }

                            adView.setNativeAd(nativeAd)
                        }
                        .withAdListener(
                            object : AdListener() {
                                override fun onAdFailedToLoad(error: LoadAdError) {
                                    super.onAdFailedToLoad(error)

                                }
                            },
                        )
                        .withNativeAdOptions(NativeAdOptions.Builder().build())
                        .build()
                    adLoader.loadAd(AdRequest.Builder().build())
                } catch (e: Exception) {
                    Log.e("Exception", e.message.toString())
                }
                binding
            },
        )
    }
}

这是UI:

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.gms.ads.nativead.NativeAdView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="test ad" />

        <ImageView
            android:id="@+id/ad_app_icon"
            android:layout_width="52dp"
            android:layout_height="52dp"
            android:adjustViewBounds="true"
            android:contentDescription="ad_icon" />

        <TextView
            android:id="@+id/ad_headline"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="16sp" />
    </LinearLayout>
</com.google.android.gms.ads.nativead.NativeAdView>