errored on angular2 gulp task

[arozwalak]

Hi,
after clone the repo and hit npm install && npm start I got:

[14:31:37] 'angular2' errored after 104 ms
[14:31:37] ModuleEvaluationError: undefined is not a function
    at /Users/arozwalak/Sites/GermanWords-frontend-angular-2/before/node_modules/systemjs-builder/node_modules/traceur/bin/traceur.js:734:3
 loaded by [email protected]/src/runtime/runtime-modules.js

and also

npm ERR! Darwin 14.4.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "start"
npm ERR! node v0.12.7
npm ERR! npm  v2.11.3
npm ERR! code ELIFECYCLE
npm ERR! [email protected] start: `gulp play`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] start script 'gulp play'.
npm ERR! This is most likely a problem with the ng2-play package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     gulp play
npm ERR! You can get their info via:
npm ERR!     npm owner ls ng2-play
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/arozwalak/Sites/GermanWords-frontend-angular-2/before/npm-debug.log

do you know what might go wrong?

[Foxandxss]

Seems like something broke on the tooling. I really need to update this article.