有谁知道asset api调用失败怎么办啊?

import asset from ‘@ohos.security.asset’; 
import util from ‘@ohos.util’; 
 
let query: asset.AssetMap = new Map(); 
query.set(asset.Tag.ALIAS, this.stringToArray('demo_alias')); // 指定了关键资产别名，最多查询到一条满足条件的关键资产 
query.set(asset.Tag.RETURN_TYPE, asset.ReturnType.ALL);  // 此处表示需要返回关键资产的所有信息，即属性+明文 
try { 
  asset.query(query).then((res: Array<asset.AssetMap>) => { 
    for (let i = 0; i < res.length; i++) { 
      // parse the secret. 
      let secret: Uint8Array = res[i].get(asset.Tag.SECRET) as Uint8Array; 
      // parse uint8array to string 
      let secretStr: string = this.arrayToString(secret); 
      console.log("secretStr:"+secretStr); 
    } 
  }).catch ((e:BusinessError) => { 
    console.error(`Failed to query Asset.:`+e); 
  }); 
} catch (error) { 
  console.error(`Failed to query Asset.`); 
} 
})