HarmonyOS taskpool.Task.sendData在异步里面为什么会报异常？

@Concurrent 
async function taskPoolFunc(context: Context, url: string, playFile: string): Promise<void> { 
  await request.downloadFile(context, { 
    url: url, 
    filePath: playFile 
  }).then((data: request.DownloadTask) => { 
    data.on('complete', () => { 
      taskpool.Task.sendData(6); 
    }) 
    data.on('fail', (err: number) => { 
      taskpool.Task.sendData(6); 
    }) 
  }).catch((err: BusinessError) => { 
    taskpool.Task.sendData(6); 
  }) 
}