react-native start 报告：Error: UNKNOWN: 未知错误，打开 ...\.babel.json

我在Windows 7上有一个正在开发的RN环境。一切都很好，直到昨天我运行“react-native start”后突然报错。\n错误信息：\n

[2016-12-26 09:58:17] HMR服务器正在监听 /hot
React打包器就绪。
fs.js:557
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
                 ^
错误: UNKNOWN: 未知错误，打开 'C:\Users\xitao\.babel.json'
    at Object.fs.openSync (fs.js:557:18)
    at Object.fs.writeFileSync (fs.js:1222:33)
    at save (C:\RN\LearnRN\node_modules\babel-register\lib\cache.js:45:16)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)
fs.js:557
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
                 ^
错误: UNKNOWN: 未知错误，打开 'C:\Users\xitao\.babel.json'
    at Object.fs.openSync (fs.js:557:18)
    at Object.fs.writeFileSync (fs.js:1222:33)
    at save (C:\RN\LearnRN\node_modules\babel-register\lib\cache.js:45:16)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)
fs.js:557
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
                 ^
错误: UNKNOWN: 未知错误，打开 'C:\Users\xitao\.babel.json'
    at Object.fs.openSync (fs.js:557:18)
    at Object.fs.writeFileSync (fs.js:1222:33)
    at save (C:\RN\LearnRN\node_modules\babel-register\lib\cache.js:45:16)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)

\n我谷歌了这个错误，没有找到解决办法。\n我删除了.babel.json文件，错误仍然出现。\n我重新初始化了一个新项目，仍然是同样的错误。我卸载了node.js和python，然后按照RN官网的“入门指南”重新安装，仍然是同样的错误。\n我安装了react-native-cli 2.0.1和1.3.0，仍然是同样的错误。\n似乎这个RN项目即使有错误也可以工作。但你永远不知道这个错误什么时候会影响到我的项目。