React native rn fetch blob取消下载-承诺拒绝

我用React Native下载文件 每件事情都正常工作，但当根据文档使用时，取消不工作并出现错误“fileFetchPromise未被删除”

我的代码：

const download = () => {
  let fileOptions = { fileCache: true, path: path, };
  const fileFetchPromise = config(fileOptions).fetch('GET', fileUrl);
  fileFetchPromise.progress({ interval : 1000 }, (received, total) => {
    let persend = 100 * received / total;
    setSaved(persend.toFixed(0));
    setReceived(bytesToSize(received));
    setTotalSize(bytesToSize(total));
  });

  fileFetchPromise.then((data) => {
    setSaved('100');
  }).catch((err) => {
    setSaved('0')
  })
}

const cancelDownload = () => {
  fileFetchPromise.cancel((err) => {})
}

如何取消（中止）提取？