node.js-v0.10.26运行小程序报错TypeError: Bad ar?报错

我的win764bit

demo.js代码如下，需要的模块已经安装过了

var say = require('say'),
colors = require('colors'),
sys = require('sys');

// no callback, fire and forget
say.speak('Alex', 'whats up, dog?');

// no callback, fire and forget
say.speak('Cellos', 'whats up, dog?');

// output some text to the console as the callback
say.speak('Good News', 'whats up, dog?', function () {
  sys.puts('text to speech complete'.green);
});

child_process.js:923
  var r = this._handle.spawn(options);
                       ^
TypeError: Bad argument
    at ChildProcess.spawn (child_process.js:923:24)
    at exports.spawn (child_process.js:723:9)
    at Object.exports.speak (E:\dropbox\HelloWorld\node\node_modules\say\lib\say
.js:56:16)
    at Object.<anonymous> (E:\dropbox\HelloWorld\node\demo.js:6:5)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)

node.js不熟悉，请大家帮忙看看！