问为什么我会有一个错误？

EN

Book = new Meteor.Collection("book");

if (Meteor.isClient) {
  Template.hello.greeting = function () {
    return "Welcome to app_01.";
  };

  Template.hello.events({
    'click input' : function () {
      // template data, if any, is available in 'this'
      if (typeof console !== 'undefined')
        console.log("You pressed the button");
    }
  });
}

if (Meteor.isServer) {
  Meteor.startup(function () {
    if (Book.find().count() === 0) {
      var names = ["Ada Lovelace",
                   "Grace Hopper",
                   "Marie Curie",
                   "Carl Friedrich Gauss",
                   "Nikola Tesla",
                   "Claude Shannon"];
      for (var i = 0; i < names.length; i++)
        Book.insert({name: names[i], score: Math.floor(Math.random()*10)*5});
    }
  });
}

No dependency info in bundle. Filesystem monitoring disabled.
Errors prevented startup:
Exception while bundling application:
Error: ENOTEMPTY, directory not empty 'C:\Users\Office\Workspace\Code\Meteor\app_01\.meteor\local\build\server'
    at Object.fs.rmdirSync (fs.js:456:18)
    at Object.module.exports.rm_recursive (C:\Program Files (x86)\Meteor\app\lib\files.js:256:10)
    at C:\Program Files (x86)\Meteor\app\lib\files.js:254:15
    at Array.forEach (native)
    at Function._.each._.forEach (C:\Program Files (x86)\Meteor\lib\node_modules\underscore\underscore.js:79:11)
    at Object.module.exports.rm_recursive (C:\Program Files (x86)\Meteor\app\lib\files.js:252:9)
    at _.extend.write_to_directory (C:\Program Files (x86)\Meteor\app\lib\bundler.js:493:11)
    at Object.exports.bundle (C:\Program Files (x86)\Meteor\app\lib\bundler.js:685:12)
    at exports.run.restart_server (C:\Program Files (x86)\Meteor\app\meteor\run.js:615:26)
    at C:\Program Files (x86)\Meteor\app\meteor\run.js:726:9

Please fix the problem and restart.

PS C:\Users\Office\Workspace\Code\Meteor\app_01> meteor
[[[[[ C:\Users\Office\Workspace\Code\Meteor\app_01 ]]]]]

Unexpected mongo exit code 100. Restarting.
Unexpected mongo exit code 100. Restarting.
Unexpected mongo exit code 100. Restarting.
Can't start mongod

MongoDB had an unspecified uncaught exception.
Check to make sure that MongoDB is able to write to its database directory.