運行grunt test的時候顯示如下信息：

Running?"connect:testserver"?(connect)?task
Started?connect?web?server?on?http://localhost:8889

Running?"karma:unit"?(karma)?task
INFO?[karma]:?Karma?v0.12.31?server?started?at?http://localhost:8890/
INFO?[launcher]:?Starting?browser?PhantomJS
ERROR?[launcher]:?Cannot?start?PhantomJS
	
INFO?[launcher]:?Trying?to?start?PhantomJS?again?(1/2).
ERROR?[launcher]:?Cannot?start?PhantomJS
	
INFO?[launcher]:?Trying?to?start?PhantomJS?again?(2/2).
ERROR?[launcher]:?Cannot?start?PhantomJS
	
ERROR?[launcher]:?PhantomJS?failed?2?times?(cannot?start).?Giving?up.
Warning:?Task?"karma:unit"?failed.?Use?--force?to?continue.

Aborted?due?to?warnings.

karma的配置是這樣的：

module.exports?=?function?(config)?{
????config.set({
????????basePath:?'../',
????????frameworks:?['jasmine'],
????????files:?[
????????????//?bower:js
????????????'bower_components/jquery/dist/jquery.js',
????????????'bower_components/angular/angular.js',
????????????'bower_components/bootstrap/dist/js/bootstrap.js',
????????????'bower_components/angular-animate/angular-animate.js',
????????????'bower_components/angular-cookies/angular-cookies.js',
????????????'bower_components/angular-route/angular-route.js',
????????????'bower_components/angular-sanitize/angular-sanitize.js',
????????????'bower_components/angular-mocks/angular-mocks.js',
????????????//?endbower
????????????'js/**/*.js',
????????????'test/spec/**/*.js'
????????],
????????browsers:?[
????????????'PhantomJS'
????????],
????????plugins:?[
????????????'karma-phantomjs-launcher',
????????????'karma-jasmine'
????????],
????????port:?8890

????})
}

請問怎么解決？謝謝