Fatal error: Unable to find Gruntfile.

[arthurlacoste]

When I try to build this example, I've this message :

$ grunt
A valid Gruntfile could not be found. Please see the getting started guide for
more information on how to configure grunt: http://gruntjs.com/getting-started
Fatal error: Unable to find Gruntfile.

[flogoetzrath]

According to the gruntjs documentation, it searches for a file named "Gruntfile.js".
I suggest you rename grunt.js to Gruntfile.js.