HarmonyOS fs.readLines报错: Msg: No error information, ErrrorCode: 0

this.result = "" 
let filePath = "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq"; 
fs.readLines(filePath).then((readerIterator: fs.ReaderIterator) => { 
  for (let it = readerIterator.next(); !it.done; it = readerIterator.next()) { 
    this.result += it.value + "\n"; 
  } 
}).catch((err: BusinessError) => { 
  console.error("open file failed with error message: " + err.message + ", error code: " + err.code); 
  this.result = "错误: " + err.message + ", " + err.code 
});

let file = fs.openSync(filePath, fs.OpenMode.READ_ONLY); 
let arrayBuffer = new ArrayBuffer(4096); 
fs.read(file.fd, arrayBuffer).then((readLen: number) => { 
  console.info("read file data succeed"); 
  let buf = buffer.from(arrayBuffer, 0, readLen); 
  console.info(`The content of file: ${buf.toString()}`); 
  this.result = buf.toString(); 
}).catch((err: BusinessError) => { 
  this.result = "Error: " + err.message; 
}).finally(() => { 
  fs.closeSync(file); 
})