Error on app amd-app.js:21


i created an atom-shell app with a correct package.json and a main just like the one on the github example that uses index.html

the app starts but nothing is showed and in console i got

LOADING LODASH!!! amd-app.js:6
Loaded mirror amd-app.js:8
Uncaught TypeError: undefined is not a function amd-app.js:21

any clue?