php - JavaScript & CSS scaffolding in Laravel 8.x

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Solution:

From laravel 6 to 7 upgrade notes: https://laravel.com/docs/7.x/upgrade

All authentication scaffolding has been moved to the laravel/ui repository. If you are using Laravel's authentication scaffolding, you should install the ^2.0 release of this package and the package should be installed in all environments. If you were previously including this package in the require-dev portion of your application's composer.json file, you should move it to the require section:

composer require laravel/ui "^2.0"

Did you run the command above before running php artisan ui?