Assets folder in Ember CLI

I'm trying to use a JSON files in my project.

But Ember opens an error page. I mean a 404 page. In router - this.route('error')

$.getScript('/myfolder/file.json').then(function (data) {   
});

I store a files in /public/assets/myfolder.

I get an error page when I call /assets/myfolder or /myfolder. But my folder is in dist and public folders

How can I fix it?

Thank you.