RequireJS: Uncaught Error: Module name "underscore" has not been loaded yet for context: _. Use require([])

I was getting the error

Uncaught Error: Module name "underscore" has not been loaded yet for context: _. Use require([])

Solved it adding the shim values in the require js config:

require.config({
    paths:{
        jquery:'jquery/jquery-min',
        underscore:'underscore/underscore-min',
        backbone:'backbone/backbone-min'
    }, 
    // here
    shim: {
        underscore: {
            exports: '_'
        },
        backbone: {
            deps: ["underscore", "jquery"],
            exports: "Backbone"
        },
        waitSeconds: 15
    }
});

Source: http://stackoverflow.com/questions/16774214/trouble-combining-require-js-and-backbone-js-underscore-js