Error: Cannot find module 'Q'

Error on build example myApp from http://ionicframework.com/getting-started/

Error on build example myApp from http://ionicframework.com/getting-started/

[user1@macosx1 myApp]$ ionic build ios

Running command: /Users/user1/Tmp/myApp/hooks/after_prepare/010_add_platform_class.js /Users/user1/Tmp/myApp
add to body class: platform-ios
Running command: /Users/user1/Tmp/myApp/hooks/after_prepare/020_remove_sass_from_platforms.js /Users/user1/Tmp/myApp
Running command: /Users/user1/Tmp/myApp/platforms/ios/cordova/build

module.js:340
throw err;
^
Error: Cannot find module 'Q’
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object. (/Users/user1/Tmp/myApp/platforms/ios/cordova/lib/check_reqs.js:25:13)
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 Module.require (module.js:364:17)