unity build android aab error

[jon-snow-qu]

The type or namespace name 'Android' does not exist in the namespace 'Google' (are you missing an assembly reference?)

Unity 6000.2.2f1
com.google.play.assetdelivery-1.9.5.unitypackage

[jon-snow-qu]

using Google.Android.AppBundle.Editor;
using Google.Android.AppBundle.Editor.AssetPacks;
using UnityEngine;

public class BuildAssetPackConfig
{
public static void ConfigureAssetPacks()
{

    var assetPackConfig = new AssetPackConfig();
    assetPackConfig.AddAssetsFolder("main_pack",                       // 资源包名称
                                    "Assets/GameMain",          // 包含资源的文件夹路径
                                    AssetPackDeliveryMode.InstallTime);    // 交付模式: OnDemand


    assetPackConfig.AddAssetsFolder("art_pack",
                                    "Assets/Art_01",
                                    AssetPackDeliveryMode.FastFollow);

    assetPackConfig.AddAssetsFolder("gameplay_pack",
                                    "Assets/GamePlay",
                                    AssetPackDeliveryMode.FastFollow);

    AssetPackConfigSerializer.SaveConfig(assetPackConfig);
}

}