项目原来一直是用nodejs跑的，这两天在玩ECMAScript 6 的新特性，于是想将项目部署到iojs下， 但是运行起来就出错了，各位大神求帮忙！！！

  js-bson: Failed to load c++ bson extension, using pure JS version
  [Error: Module did not self-register.]
  js-bson: Failed to load c++ bson extension, using pure JS version
  module.js:500
  modulePaths = paths;
  ^
  Error: Module version mismatch. Expected 44, got 14.
  at Error (native)
  at Module.load (module.js:356:32)
  at Function.Module._load (module.js:311:12)
  at Module.require (module.js:366:17)
  at require (module.js:385:17)