After running
yo ionic
from https://github.com/diegonetto/generator-ionic
Then lauching grunt serve i\'ve got this :
grunt serve
I update grunt-wiredep npm install --save-dev grunt-wiredep and then run a bower install bower install jquery --save I call the Grunt task grunt wiredep and it was done without any errors, finally i could run grunt serve
npm install --save-dev grunt-wiredep
bower install jquery --save
grunt wiredep