Why are my CSS and JS files not recognized?

Hi,

I added this code in my functions.php

wp_deregister_style( 'aurora-grid' );
        wp_enqueue_style( 'aurora-grid', '/assets/css/grid.min.css', false, null, 'all');

and the same for my JS file.

I see the files being added to my WordPress page, but I don’t know why it return a 404 error for those files. Like, it exist and all, but at the same time, it’s like if they weren’t there.

I have this error : Failed to load resource: the server responded with a status of 404 (Not Found)

Thank you for your help.