I have push my simple php app to Heroku and get 403 status for some js files.
https://guarded-forest-7267.herokuapp.com/vendor/jquery/dist/jquery.min.js Failed to load resource: the server responded with a status of 403 (Forbidden)
https://guarded-forest-7267.herokuapp.com/vendor/jquery-form/jquery.form.js Failed to load resource: the server responded with a status of 403 (Forbidden)
https://guarded-forest-7267.herokuapp.com/vendor/jquery-validate/dist/jquery.validate.min.js Failed to load resource: the server responded with a status of 403 (Forbidden)
https://guarded-forest-7267.herokuapp.com/vendor/jquery.inputmask/dist/inputmask/jquery.inputmask.js Failed to load resource: the server responded with a status of 403 (Forbidden)
https://guarded-forest-7267.herokuapp.com/vendor/modernizer/modernizr.js Failed to load resource: the server responded with a status of 403 (Forbidden)
https://guarded-forest-7267.herokuapp.com/vendor/jselector/src/jquery.jselector.js Failed to load resource: the server responded with a status of 403 (Forbidden)
https://guarded-forest-7267.herokuapp.com/vendor/rubber-carousel/dist/jquery.rubber-carousel.min.js Failed to load resource: the server responded with a status of 403 (Forbidden)
https://guarded-forest-7267.herokuapp.com/vendor/jmodal/src/jquery.jmodal.js Failed to load resource: the server responded with a status of 403 (Forbidden)
https://guarded-forest-7267.herokuapp.com/vendor/scrollReveal.js/dist/scrollReveal.min.js Failed to load resource: the server responded with a status of 403 (Forbidden)
Whats the problem can be?