listenTo does not listen to their respective Rigger

Question

I have several other listenTo respond correctly to your Rigger, however this below is not responding, I have tried in every way to make her answer, but all attempts were unsuccessful.

addFotoPrincipal: function(){
            app.vent.trigger('fotoPrincipal');
        },

this.listenTo(app.vent, 'fotoPrincipal', function(){
            console.log('teste');
        });

Answer 1

I found the error, what happens is that the listenTo is in a file that is not connected in any way to Trigger and the view where the listenTo is not loaded in memory, so the listenTo will never listen to Trigger.