Do not load the files on the server (Failed to load resource)

This is the error:

Failed to load resource: the server responded with a status of 403 (Forbidden)

I was developing an html template and everything is great locally ... now that I uploaded it to the server, the JS files and the image files do not load, only the CSS.

Does anyone know what could happen? or how could he solve it?

these are the files that do not load ..

<script src="js/popper.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script src="js/chart.bundle.min.js"></script>
<script src="js/script.min.js"></script>

I get into the route directly and the files, if they exist, load without problem