DevTools failed to load source map: Could not load content for http://localhost:8000/js/popper.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
Checked :
package.json
...
"popper.js": "^1.16.1",
...
node_modules/popper.js/dist/popper.js - Checked
Now, go to webpack.mix.js - This archive is responsible for doing all the
compilation of our application's assets - See documentation at
https://laravel.com/docs/8.x/mix
webpack.mix.js
mix.js('resources/js/app.js', 'public/js')
// using sourceMaps() because the error is about popper.js.map
.js("node_modules/popper.js/dist/popper.js", 'public/js').sourceMaps()
.vue()
.sass('resources/sass/app.scss', 'public/css');
public/js/popper.js - Checked
In the end restart the application and it must works!