HarmonyOS 获取媒体文件失败13900012

我们希望自己做一个图片选择器，使用以下官方文档提供的方式编译媒体库

但是提示没有权限。fetchResult fail with error: 13900012, without medialibrary permission

这个api所涉及的权限，不对normal应用开放么？

let predicates: dataSharePredicates.DataSharePredicates = new dataSharePredicates.DataSharePredicates();
let fetchOptions: photoAccessHelper.FetchOptions = {
  fetchColumns: [],
  predicates: predicates
};

photoAccessHelper.getPhotoAccessHelper(this.context).getAssets(fetchOptions, async (err, fetchResult) => {
  if (fetchResult !== undefined) {
    console.info('fetchResult success');
    let photoAsset: photoAccessHelper.PhotoAsset = await fetchResult.getFirstObject();
    if (photoAsset !== undefined) {
      console.info('photoAsset.displayName : ' + photoAsset.displayName);
    }
  } else {
    console.error(`fetchResult fail with error: ${err.code}, ${err.message}`);
  }
});